util,console: colorize regexp groups, character classes, etc

This adds a parser to parse the regular expression and to highlight
different parts of a regular expression in case colors are active.

It is a one time pass algorithm and should therefore not cause too
much overhead during parsing.

As side effect, it is now possible to create individual styles to
colorize inspected values values as a user likes. This might for
example be expanded to numbers with numeric separators, highlighting
the separators or decimal points different.

It would in theory also be possible to return a changed string.
That is however not the intention for this API as it is only
triggered in case colors are active.

PR-URL: https://github.com/nodejs/node/pull/59710
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Jordan Harband <ljharb@gmail.com>

doc/api/util.md

@@ -847,6 +847,11 @@ stream.write('With ES6');
 <!-- YAML
 added: v0.3.0
 changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/59710
+    description: The util.inspect.styles.regexp style is now a method that is
+                 invoked for coloring the stringified regular expression.
   - version:
     - v17.3.0
     - v16.14.0
@@ -1297,7 +1302,12 @@ The default styles and associated colors are:
 * `name`: (no styling)
 * `null`: `bold`
 * `number`: `yellow`
-* `regexp`: `red`
+* `regexp`: A method that colors character classes, groups, assertions, and
+  other parts for improved readability. To customize the coloring, change the
+  `colors` property. It is set to
+  `['red', 'green', 'yellow', 'cyan', 'magenta']` by default and may be
+  adjusted as needed. The array is repetitively iterated through depending on
+  the "depth".
 * `special`: `cyan` (e.g., `Proxies`)
 * `string`: `green`
 * `symbol`: `green`
@@ -1309,6 +1319,17 @@ terminals. To verify color support use [`tty.hasColors()`][].
 Predefined control codes are listed below (grouped as "Modifiers", "Foreground
 colors", and "Background colors").
 
+#### Complex custom coloring
+
+It is possible to define a method as style. It receives the stringified value
+of the input. It is invoked in case coloring is active and the type is
+inspected.
+
+Example: `util.inspect.styles.regexp(value)`
+
+* `value` {string} The string representation of the input type.
+* Returns: {string} The adjusted representation of `object`.
+
 #### Modifiers
 
 Modifier support varies throughout different terminals. They will mostly be

lib/internal/util/inspect.js

@@ -502,7 +502,6 @@ defineColorAlias('inverse', 'swapColors');
 defineColorAlias('inverse', 'swapcolors');
 defineColorAlias('doubleunderline', 'doubleUnderline');
 
-// TODO(BridgeAR): Add function style support for more complex styles.
 // Don't use 'blue' not visible on cmd.exe
 inspect.styles = ObjectAssign({ __proto__: null }, {
   special: 'cyan',
@@ -515,11 +514,259 @@ inspect.styles = ObjectAssign({ __proto__: null }, {
   symbol: 'green',
   date: 'magenta',
   // "name": intentionally not styling
-  // TODO(BridgeAR): Highlight regular expressions properly.
+  regexp: highlightRegExp,
-  regexp: 'red',
   module: 'underline',
 });
 
+// Define the palette for RegExp group depth highlighting. Can be changed by users.
+inspect.styles.regexp.colors = ['green', 'red', 'yellow', 'cyan', 'magenta'];
+
+const highlightRegExpColors = inspect.styles.regexp.colors.slice();
+
+/**
+ * Colorize a JavaScript RegExp pattern per ECMAScript grammar.
+ * This is a tolerant single-pass highlighter using heuristics in some cases.
+ * It supports: groups (named/unnamed, lookaround), assertions, alternation,
+ * quantifiers, escapes (incl. Unicode properties), character classes and
+ * backreferences.
+ * @param {string} regexpString
+ * @returns {string}
+ */
+function highlightRegExp(regexpString) {
+  let out = '';
+  let i = 0;
+  let depth = 0;
+  let inClass = false;
+
+  // TODO(BridgeAR): Add group type tracking. That allows to increase the depth
+  // in case the same type is next to each other.
+  // let groupType = 0;
+
+  // Verify palette and update cache if user changed colors
+  const paletteNames = highlightRegExp.colors?.length > 0 ?
+    highlightRegExp.colors :
+    highlightRegExpColors;
+
+  const palette = paletteNames.reduce((acc, name) => {
+    const color = inspect.colors[name];
+    if (color) acc.push([`\u001b[${color[0]}m`, `\u001b[${color[1]}m`]);
+    return acc;
+  }, []);
+
+  function writeGroup(start, end, decreaseDepth = 1) {
+    let seq = '';
+    i++;
+    // Only checking for the closing delimiter is a fast heuristic for regular
+    // expressions without the u or v flag. A safer check would verify that the
+    // read characters are all alphanumeric.
+    while (i < regexpString.length && regexpString[i] !== end) {
+      seq += regexpString[i++];
+    }
+    if (i < regexpString.length) {
+      depth -= decreaseDepth;
+      write(start);
+      writeDepth(seq, 1, 1);
+      write(end);
+      depth += decreaseDepth;
+    } else {
+      // The group is not closed which would lead to mistakes in the output.
+      // This is a workaround to prevent output from being corrupted.
+      writeDepth(start, 1, -seq.length);
+    }
+  }
+
+  const write = (str) => {
+    const idx = depth % palette.length;
+    // Safeguard against bugs in the implementation.
+    const color = palette[idx] ?? palette[0];
+    out += color[0] + str + color[1];
+    return idx;
+  };
+
+  function writeDepth(str, incDepth, incI) {
+    depth += incDepth;
+    write(str);
+    depth -= incDepth;
+    i += incI;
+  }
+
+  // Opening '/'
+  write('/');
+  depth++;
+  i = 1;
+
+  // Parse pattern until next unescaped '/'
+  while (i < regexpString.length) {
+    const ch = regexpString[i];
+
+    if (inClass) {
+      if (ch === '\\') {
+        let seq = '\\';
+        i++;
+        if (i < regexpString.length) {
+          seq += regexpString[i++];
+          const next = seq[1];
+          if (next === 'u' && regexpString[i] === '{') {
+            writeGroup(`${seq}{`, '}', 0);
+            continue;
+          } else if ((next === 'p' || next === 'P') && regexpString[i] === '{') {
+            writeGroup(`${seq}{`, '}', 0);
+            continue;
+          } else if (seq[1] === 'x') {
+            seq += regexpString.slice(i, i + 2);
+            i += 2;
+          }
+        }
+        write(seq);
+      } else if (ch === ']') {
+        depth--;
+        write(']');
+        i++;
+        inClass = false;
+      } else if (ch === '-' && regexpString[i - 1] !== '[' &&
+                 i + 1 < regexpString.length && regexpString[i + 1] !== ']') {
+        writeDepth('-', 1, 1);
+      } else {
+        write(ch);
+        i++;
+      }
+    } else if (ch === '[') {
+      // Enter class
+      write('[');
+      depth++;
+      i++;
+      inClass = true;
+    } else if (ch === '(') {
+      write('(');
+      depth++;
+      i++;
+      if (i < regexpString.length && regexpString[i] === '?') {
+        // Assertions and named groups
+        i++;
+        const a = i < regexpString.length ? regexpString[i] : '';
+        if (a === ':' || a === '=' || a === '!') {
+          writeDepth(`?${a}`, -1, 1);
+        } else {
+          const b = i + 1 < regexpString.length ? regexpString[i + 1] : '';
+          if (a === '<' && (b === '=' || b === '!')) {
+            writeDepth(`?<${b}`, -1, 2);
+          } else if (a === '<') {
+            // Named capture: write '?<name>' as a single colored token
+            i++; // consume '<'
+            const start = i;
+            while (i < regexpString.length && regexpString[i] !== '>') {
+              i++;
+            }
+            const name = regexpString.slice(start, i);
+            if (i < regexpString.length && regexpString[i] === '>') {
+              depth--;
+              write('?<');
+              writeDepth(name, 1, 0);
+              write('>');
+              depth++;
+              i++;
+            } else {
+              writeDepth('?<', -1, 0);
+              write(name);
+            }
+          } else {
+            write('?');
+          }
+        }
+      }
+    } else if (ch === ')') {
+      depth--;
+      write(')');
+      i++;
+    } else if (ch === '\\') {
+      let seq = '\\';
+      i++;
+      if (i < regexpString.length) {
+        seq += regexpString[i++];
+        const next = seq[1];
+        if (i < regexpString.length) {
+          if (next === 'u' && regexpString[i] === '{') {
+            writeGroup(`${seq}{`, '}', 0);
+            continue;
+          } else if (next === 'x') {
+            seq += regexpString.slice(i, i + 2);
+            i += 2;
+          } else if (next >= '0' && next <= '9') {
+            while (i < regexpString.length && regexpString[i] >= '0' && regexpString[i] <= '9') {
+              seq += regexpString[i++];
+            }
+          } else if (next === 'k' && regexpString[i] === '<') {
+            writeGroup(`${seq}<`, '>');
+            continue;
+          } else if ((next === 'p' || next === 'P') && regexpString[i] === '{') {
+            // Unicode properties
+            writeGroup(`${seq}{`, '}', 0);
+            continue;
+          }
+        }
+      }
+      writeDepth(seq, 1, 0);
+    } else if (ch === '|' || ch === '+' || ch === '*' || ch === '?' || ch === ',' || ch === '^' || ch === '$') {
+      writeDepth(ch, 3, 1);
+    } else if (ch === '{') {
+      i++;
+      let digits = '';
+      while (i < regexpString.length && regexpString[i] >= '0' && regexpString[i] <= '9') {
+        digits += regexpString[i++];
+      }
+      if (digits) {
+        write('{');
+        depth++;
+        writeDepth(digits, 1, 0);
+      }
+      if (i < regexpString.length) {
+        if (regexpString[i] === ',') {
+          if (!digits) {
+            write('{');
+            depth++;
+          }
+          write(',');
+          i++;
+        } else if (!digits) {
+          depth += 1;
+          write('{');
+          depth -= 1;
+          continue;
+        }
+      }
+      let digits2 = '';
+      while (i < regexpString.length && regexpString[i] >= '0' && regexpString[i] <= '9') {
+        digits2 += regexpString[i++];
+      }
+      if (digits2) {
+        writeDepth(digits2, 1, 0);
+      }
+      if (i < regexpString.length && regexpString[i] === '}') {
+        depth--;
+        write('}');
+        i++;
+      }
+      if (i < regexpString.length && regexpString[i] === '?') {
+        writeDepth('?', 3, 1);
+      }
+    } else if (ch === '.') {
+      writeDepth(ch, 2, 1);
+    } else if (ch === '/') {
+      // Stop at closing delimiter (unescaped, outside of character class)
+      break;
+    } else {
+      writeDepth(ch, 1, 1);
+    }
+  }
+
+  // Closing delimiter and flags
+  writeDepth('/', -1, 1);
+  if (i < regexpString.length) {
+    write(regexpString.slice(i));
+  }
+  return out;
+}
+
 function addQuotes(str, quotes) {
   if (quotes === -1) {
     return `"${str}"`;
@@ -606,8 +853,12 @@ function stylizeWithColor(str, styleType) {
   const style = inspect.styles[styleType];
   if (style !== undefined) {
     const color = inspect.colors[style];
-    if (color !== undefined)
+    if (color !== undefined) {
       return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
+    }
+    if (typeof style === 'function') {
+      return style(str);
+    }
   }
   return str;
 }
@@ -1048,9 +1299,10 @@ function formatRaw(ctx, value, recurseTimes, typedArray) {
       const prefix = getPrefix(constructor, tag, 'RegExp');
       if (prefix !== 'RegExp ')
         base = `${prefix}${base}`;
+      base = ctx.stylize(base, 'regexp');
       if ((keys.length === 0 && protoProps === undefined) ||
           (recurseTimes > ctx.depth && ctx.depth !== null)) {
-        return ctx.stylize(base, 'regexp');
+        return base;
       }
     } else if (isDate(value)) {
       // Make dates with properties first say the date

test/parallel/test-util-inspect-regexp.js

@@ -0,0 +1,150 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const util = require('util');
+
+util.inspect.defaultOptions.compact = 5;
+util.inspect.defaultOptions.breakLength = Infinity;
+
+function expectColored([regexp, expected]) {
+  if (!common.hasIntl && !regexp) {
+    return;
+  }
+  const colored = util.inspect(regexp, { colors: true });
+  const plain = util.inspect(regexp, { colors: false });
+  try {
+    assert.strictEqual(util.stripVTControlCharacters(colored), plain);
+    assert.strictEqual(colored, expected, `${regexp} failed`);
+  } catch (error) {
+    console.log('\nInspecting regular expression', colored, '\n');
+    throw error;
+  }
+}
+
+function createRegExp(string, flags) {
+  if (common.hasIntl) {
+    return new RegExp(string, flags);
+  }
+}
+
+/* eslint-disable node-core/no-unescaped-regexp-dot */
+/* eslint-disable @stylistic/js/max-len */
+
+// Comprehensive set of regexes covering branches in highlightRegExp
+const tests = [
+  [/a/, '\x1B[32m/\x1B[39m\x1B[33ma\x1B[39m\x1B[32m/\x1B[39m'],
+  [/a|b/, '\x1B[32m/\x1B[39m\x1B[33ma\x1B[39m\x1B[35m|\x1B[39m\x1B[33mb\x1B[39m\x1B[32m/\x1B[39m'],
+  [/^$/, '\x1B[32m/\x1B[39m\x1B[35m^\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m'],
+  [/^(?<year>\d{4})-(?<mon>0[1-9]|1[0-2])-(?<day>0[1-9]|[12]\d|3[01])$/u, '\x1B[32m/\x1B[39m\x1B[35m^\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33myear\x1B[39m\x1B[31m>\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[35m4\x1B[39m\x1B[33m}\x1B[39m\x1B[31m)\x1B[39m\x1B[33m-\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33mmon\x1B[39m\x1B[31m>\x1B[39m\x1B[36m0\x1B[39m\x1B[33m[\x1B[39m\x1B[36m1\x1B[39m\x1B[35m-\x1B[39m\x1B[36m9\x1B[39m\x1B[33m]\x1B[39m\x1B[32m|\x1B[39m\x1B[36m1\x1B[39m\x1B[33m[\x1B[39m\x1B[36m0\x1B[39m\x1B[35m-\x1B[39m\x1B[36m2\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[33m-\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33mday\x1B[39m\x1B[31m>\x1B[39m\x1B[36m0\x1B[39m\x1B[33m[\x1B[39m\x1B[36m1\x1B[39m\x1B[35m-\x1B[39m\x1B[36m9\x1B[39m\x1B[33m]\x1B[39m\x1B[32m|\x1B[39m\x1B[33m[\x1B[39m\x1B[36m1\x1B[39m\x1B[36m2\x1B[39m\x1B[33m]\x1B[39m\x1B[36m\\d\x1B[39m\x1B[32m|\x1B[39m\x1B[36m3\x1B[39m\x1B[33m[\x1B[39m\x1B[36m0\x1B[39m\x1B[36m1\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m\x1B[31mu\x1B[39m'],
+  [/^(?=.*[A-Z])(?=.*\d)(?=.*[^\w\s]).{12,}$/, '\x1B[32m/\x1B[39m\x1B[35m^\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?=\x1B[39m\x1B[35m.\x1B[39m\x1B[32m*\x1B[39m\x1B[33m[\x1B[39m\x1B[36mA\x1B[39m\x1B[35m-\x1B[39m\x1B[36mZ\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?=\x1B[39m\x1B[35m.\x1B[39m\x1B[32m*\x1B[39m\x1B[36m\\d\x1B[39m\x1B[31m)\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?=\x1B[39m\x1B[35m.\x1B[39m\x1B[32m*\x1B[39m\x1B[33m[\x1B[39m\x1B[36m^\x1B[39m\x1B[36m\\w\x1B[39m\x1B[36m\\s\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[36m.\x1B[39m\x1B[31m{\x1B[39m\x1B[36m12\x1B[39m\x1B[33m,\x1B[39m\x1B[31m}\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m'],
+  [/\b(?<!\$)\d{1,3}(?:,\d{3})*(?:\.\d+)?\b/, '\x1B[32m/\x1B[39m\x1B[33m\\b\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<!\x1B[39m\x1B[36m\\$\x1B[39m\x1B[31m)\x1B[39m\x1B[33m\\d\x1B[39m\x1B[31m{\x1B[39m\x1B[36m1\x1B[39m\x1B[33m,\x1B[39m\x1B[36m3\x1B[39m\x1B[31m}\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[32m,\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[35m3\x1B[39m\x1B[33m}\x1B[39m\x1B[31m)\x1B[39m\x1B[35m*\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36m\\.\x1B[39m\x1B[36m\\d\x1B[39m\x1B[32m+\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[33m\\b\x1B[39m\x1B[32m/\x1B[39m'],
+  [/\b\w+(?=\s*:\s)/, '\x1B[32m/\x1B[39m\x1B[33m\\b\x1B[39m\x1B[33m\\w\x1B[39m\x1B[35m+\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?=\x1B[39m\x1B[36m\\s\x1B[39m\x1B[32m*\x1B[39m\x1B[36m:\x1B[39m\x1B[36m\\s\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/^(?:https?:\/\/)?(?:www\.)?[\w.-]+\.[A-Za-z]{2,}(?:\/[^\s?#]*)?(?:\?[^\s#]*)?(?:#[^\s]*)?$/, '\x1B[32m/\x1B[39m\x1B[35m^\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36mh\x1B[39m\x1B[36mt\x1B[39m\x1B[36mt\x1B[39m\x1B[36mp\x1B[39m\x1B[36ms\x1B[39m\x1B[32m?\x1B[39m\x1B[36m:\x1B[39m\x1B[36m\\/\x1B[39m\x1B[36m\\/\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36mw\x1B[39m\x1B[36mw\x1B[39m\x1B[36mw\x1B[39m\x1B[36m\\.\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[31m[\x1B[39m\x1B[33m\\w\x1B[39m\x1B[33m.\x1B[39m\x1B[33m-\x1B[39m\x1B[31m]\x1B[39m\x1B[35m+\x1B[39m\x1B[33m\\.\x1B[39m\x1B[31m[\x1B[39m\x1B[33mA\x1B[39m\x1B[36m-\x1B[39m\x1B[33mZ\x1B[39m\x1B[33ma\x1B[39m\x1B[36m-\x1B[39m\x1B[33mz\x1B[39m\x1B[31m]\x1B[39m\x1B[31m{\x1B[39m\x1B[36m2\x1B[39m\x1B[33m,\x1B[39m\x1B[31m}\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36m\\/\x1B[39m\x1B[33m[\x1B[39m\x1B[36m^\x1B[39m\x1B[36m\\s\x1B[39m\x1B[36m?\x1B[39m\x1B[36m#\x1B[39m\x1B[33m]\x1B[39m\x1B[32m*\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36m\\?\x1B[39m\x1B[33m[\x1B[39m\x1B[36m^\x1B[39m\x1B[36m\\s\x1B[39m\x1B[36m#\x1B[39m\x1B[33m]\x1B[39m\x1B[32m*\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36m#\x1B[39m\x1B[33m[\x1B[39m\x1B[36m^\x1B[39m\x1B[36m\\s\x1B[39m\x1B[33m]\x1B[39m\x1B[32m*\x1B[39m\x1B[31m)\x1B[39m\x1B[35m?\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m'],
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+  [/(?=a)/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?=\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?!a)/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?!\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?<=a)/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<=\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?<!a)/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<!\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?<name>a)/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33mname\x1B[39m\x1B[31m>\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?<name>a)\k<name>/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33mname\x1B[39m\x1B[31m>\x1B[39m\x1B[36ma\x1B[39m\x1B[31m)\x1B[39m\x1B[32m\\k<\x1B[39m\x1B[31mname\x1B[39m\x1B[32m>\x1B[39m\x1B[32m/\x1B[39m'],
+  [createRegExp('\\p{Letter}+', 'u'), '\x1B[32m/\x1B[39m\x1B[31m\\p{\x1B[39m\x1B[33mLetter\x1B[39m\x1B[31m}\x1B[39m\x1B[35m+\x1B[39m\x1B[32m/\x1B[39m\x1B[31mu\x1B[39m'],
+  [/[\u{1F600}-\u{1F601}]/u, '\x1B[32m/\x1B[39m\x1B[31m[\x1B[39m\x1B[33m\\u{\x1B[39m\x1B[36m1F600\x1B[39m\x1B[33m}\x1B[39m\x1B[36m-\x1B[39m\x1B[33m\\u{\x1B[39m\x1B[36m1F601\x1B[39m\x1B[33m}\x1B[39m\x1B[31m]\x1B[39m\x1B[32m/\x1B[39m\x1B[31mu\x1B[39m'],
+  [/\x61/, '\x1B[32m/\x1B[39m\x1B[33m\\x61\x1B[39m\x1B[32m/\x1B[39m'],
+  [/\u{1F600}/u, '\x1B[32m/\x1B[39m\x1B[31m\\u{\x1B[39m\x1B[33m1F600\x1B[39m\x1B[31m}\x1B[39m\x1B[32m/\x1B[39m\x1B[31mu\x1B[39m'],
+  [/[a-z-]/, '\x1B[32m/\x1B[39m\x1B[31m[\x1B[39m\x1B[33ma\x1B[39m\x1B[36m-\x1B[39m\x1B[33mz\x1B[39m\x1B[33m-\x1B[39m\x1B[31m]\x1B[39m\x1B[32m/\x1B[39m'],
+  [/[a-z-]/, '\x1B[32m/\x1B[39m\x1B[31m[\x1B[39m\x1B[33ma\x1B[39m\x1B[36m-\x1B[39m\x1B[33mz\x1B[39m\x1B[33m-\x1B[39m\x1B[31m]\x1B[39m\x1B[32m/\x1B[39m'],
+  [/.{2,3}?abc?/, '\x1B[32m/\x1B[39m\x1B[36m.\x1B[39m\x1B[31m{\x1B[39m\x1B[36m2\x1B[39m\x1B[33m,\x1B[39m\x1B[36m3\x1B[39m\x1B[31m}\x1B[39m\x1B[35m?\x1B[39m\x1B[33ma\x1B[39m\x1B[33mb\x1B[39m\x1B[33mc\x1B[39m\x1B[35m?\x1B[39m\x1B[32m/\x1B[39m'],
+  [/a{2}/, '\x1B[32m/\x1B[39m\x1B[33ma\x1B[39m\x1B[31m{\x1B[39m\x1B[36m2\x1B[39m\x1B[31m}\x1B[39m\x1B[32m/\x1B[39m'],
+  [/\d/, '\x1B[32m/\x1B[39m\x1B[33m\\d\x1B[39m\x1B[32m/\x1B[39m'],
+  [/[^a-z\d\u{1F600}-\u{1F601}]/u, '\x1B[32m/\x1B[39m\x1B[31m[\x1B[39m\x1B[33m^\x1B[39m\x1B[33ma\x1B[39m\x1B[36m-\x1B[39m\x1B[33mz\x1B[39m\x1B[33m\\d\x1B[39m\x1B[33m\\u{\x1B[39m\x1B[36m1F600\x1B[39m\x1B[33m}\x1B[39m\x1B[36m-\x1B[39m\x1B[33m\\u{\x1B[39m\x1B[36m1F601\x1B[39m\x1B[33m}\x1B[39m\x1B[31m]\x1B[39m\x1B[32m/\x1B[39m\x1B[31mu\x1B[39m'],
+  [/(?<year>\d{4})-\d{2}|\d{2}-(?<year>\d{4})/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33myear\x1B[39m\x1B[31m>\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[35m4\x1B[39m\x1B[33m}\x1B[39m\x1B[31m)\x1B[39m\x1B[33m-\x1B[39m\x1B[33m\\d\x1B[39m\x1B[31m{\x1B[39m\x1B[36m2\x1B[39m\x1B[31m}\x1B[39m\x1B[35m|\x1B[39m\x1B[33m\\d\x1B[39m\x1B[31m{\x1B[39m\x1B[36m2\x1B[39m\x1B[31m}\x1B[39m\x1B[33m-\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33myear\x1B[39m\x1B[31m>\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[35m4\x1B[39m\x1B[33m}\x1B[39m\x1B[31m)\x1B[39m\x1B[32m/\x1B[39m'],
+  [/(?<=Mr\.|Mrs.)\s[A-Z]\w+/, '\x1B[32m/\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<=\x1B[39m\x1B[36mM\x1B[39m\x1B[36mr\x1B[39m\x1B[36m\\.\x1B[39m\x1B[32m|\x1B[39m\x1B[36mM\x1B[39m\x1B[36mr\x1B[39m\x1B[36ms\x1B[39m\x1B[35m.\x1B[39m\x1B[31m)\x1B[39m\x1B[33m\\s\x1B[39m\x1B[31m[\x1B[39m\x1B[33mA\x1B[39m\x1B[36m-\x1B[39m\x1B[33mZ\x1B[39m\x1B[31m]\x1B[39m\x1B[33m\\w\x1B[39m\x1B[35m+\x1B[39m\x1B[32m/\x1B[39m'],
+  [/a/giu, '\x1B[32m/\x1B[39m\x1B[33ma\x1B[39m\x1B[32m/\x1B[39m\x1B[31mgiu\x1B[39m'],
+  [/\p{Let(?<quote>["'])(?:\.|(?!\k<quote>)[\s\S])*\k<quote>$/, `\x1B[32m/\x1B[39m\x1B[33m\\p{\x1B[39m\x1B[33mL\x1B[39m\x1B[33me\x1B[39m\x1B[33mt\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?<\x1B[39m\x1B[33mquote\x1B[39m\x1B[31m>\x1B[39m\x1B[33m[\x1B[39m\x1B[36m"\x1B[39m\x1B[36m'\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36m\\.\x1B[39m\x1B[32m|\x1B[39m\x1B[33m(\x1B[39m\x1B[33m?!\x1B[39m\x1B[33m\\k<\x1B[39m\x1B[36mquote\x1B[39m\x1B[33m>\x1B[39m\x1B[33m)\x1B[39m\x1B[33m[\x1B[39m\x1B[36m\\s\x1B[39m\x1B[36m\\S\x1B[39m\x1B[33m]\x1B[39m\x1B[31m)\x1B[39m\x1B[35m*\x1B[39m\x1B[32m\\k<\x1B[39m\x1B[31mquote\x1B[39m\x1B[32m>\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m`],
+  [/^p{Lu}p{Ll}+(?:sp{Lu}p{Ll}+)+$/, '\x1B[32m/\x1B[39m\x1B[35m^\x1B[39m\x1B[33mp\x1B[39m\x1B[33m{\x1B[39m\x1B[33mL\x1B[39m\x1B[33mu\x1B[39m\x1B[33m}\x1B[39m\x1B[33mp\x1B[39m\x1B[33m{\x1B[39m\x1B[33mL\x1B[39m\x1B[33ml\x1B[39m\x1B[33m}\x1B[39m\x1B[35m+\x1B[39m\x1B[31m(\x1B[39m\x1B[31m?:\x1B[39m\x1B[36ms\x1B[39m\x1B[36mp\x1B[39m\x1B[36m{\x1B[39m\x1B[36mL\x1B[39m\x1B[36mu\x1B[39m\x1B[36m}\x1B[39m\x1B[36mp\x1B[39m\x1B[36m{\x1B[39m\x1B[36mL\x1B[39m\x1B[36ml\x1B[39m\x1B[36m}\x1B[39m\x1B[32m+\x1B[39m\x1B[31m)\x1B[39m\x1B[35m+\x1B[39m\x1B[35m$\x1B[39m\x1B[32m/\x1B[39m'],
+];
+
+for (const test of tests) {
+  expectColored(test);
+}
+
+// These test cases do not highlight the regular expression correctly.
+const brokenTests = [
+  [/\p{Let(?<quote>["'])(?:\.|\p{quote}[\s\S])*\k<quote>$/, `\x1B[32m/\x1B[39m\x1B[31m\\p{\x1B[39m\x1B[33mLet(?<quote>["'])(?:\\.|\\p{quote\x1B[39m\x1B[31m}\x1B[39m\x1B[31m[\x1B[39m\x1B[33m\\s\x1B[39m\x1B[33m\\S\x1B[39m\x1B[31m]\x1B[39m\x1B[32m)\x1B[39m\x1B[36m*\x1B[39m\x1B[32m\\k<\x1B[39m\x1B[32mquote\x1B[39m\x1B[32m>\x1B[39m\x1B[36m$\x1B[39m\x1B[32m/\x1B[39m`],
+];
+
+for (const test of brokenTests) {
+  expectColored(test);
+}
+
+{
+  const regexp = /(?<year>\d{4})-\d{2}|\d{2}-(?<year>\d{4})/;
+  const regular = util.inspect(regexp, { colors: true });
+
+  util.inspect.styles.regexp.colors = [];
+  const emptyColorArray = util.inspect(regexp, { colors: true });
+
+  assert.strictEqual(emptyColorArray, regular);
+
+  util.inspect.styles.regexp.colors = undefined;
+  const undefinedColors = util.inspect(regexp, { colors: true });
+
+  assert.strictEqual(undefinedColors, regular);
+
+  util.inspect.styles.regexp.colors = ['red', 'yellow', 'cyan'];
+  const customColors = util.inspect(regexp, { colors: true });
+
+  assert.strictEqual(
+    customColors,
+    '\x1B[31m/\x1B[39m\x1B[33m(\x1B[39m\x1B[33m?<\x1B[39m\x1B[36myear\x1B[39m\x1B[33m>\x1B[39m\x1B[31m\\d\x1B[39m\x1B[36m{\x1B[39m\x1B[33m4\x1B[39m\x1B[36m}\x1B[39m\x1B[33m)\x1B[39m\x1B[36m-\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[31m2\x1B[39m\x1B[33m}\x1B[39m\x1B[33m|\x1B[39m\x1B[36m\\d\x1B[39m\x1B[33m{\x1B[39m\x1B[31m2\x1B[39m\x1B[33m}\x1B[39m\x1B[36m-\x1B[39m\x1B[33m(\x1B[39m\x1B[33m?<\x1B[39m\x1B[36myear\x1B[39m\x1B[33m>\x1B[39m\x1B[31m\\d\x1B[39m\x1B[36m{\x1B[39m\x1B[33m4\x1B[39m\x1B[36m}\x1B[39m\x1B[33m)\x1B[39m\x1B[31m/\x1B[39m'
+  );
+
+  util.inspect.styles.regexp = 'red';
+  const redStyle = util.inspect(regexp, { colors: true });
+
+  assert.strictEqual(redStyle, '\x1B[31m/(?<year>\\d{4})-\\d{2}|\\d{2}-(?<year>\\d{4})/\x1B[39m');
+}

test/parallel/test-util-inspect.js

@@ -922,7 +922,7 @@ assert.strictEqual(util.inspect({ __proto__: Date.prototype }), 'Date {}');
   testColorStyle('null', null);
   testColorStyle('string', 'test string');
   testColorStyle('date', new Date());
-  testColorStyle('regexp', /regexp/);
+  // RegExp now uses token-level highlighting; verified in a dedicated test file.
 }
 
 // An object with "hasOwnProperty" overwritten should not throw.

test/sequential/test-util-debug.js

@@ -73,9 +73,8 @@ function test(environ, shouldWrite, section, forceColors = false) {
       const addCodes = (arr) => [`\x1B[${arr[0]}m`, `\x1B[${arr[1]}m`];
       const num = addCodes(colors[styles.number]);
       const str = addCodes(colors[styles.string]);
-      const regexp = addCodes(colors[styles.regexp]);
       const start = `${section.toUpperCase()} ${num[0]}${child.pid}${num[1]}`;
-      const debugging = `${regexp[0]}/debugging/${regexp[1]}`;
+      const debugging = styles.regexp('/debugging/');
       expectErr =
         `${start}: this { is: ${str[0]}'a'${str[1]} } ${debugging}\n` +
         `${start}: num=1 str=a obj={"foo":"bar"}\n`;