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February 5, 2023 08:47
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Generating a regular expression to match valid JavaScript identifiers (like https://mathiasbynens.be/demo/javascript-identifier-regex) in Node.js
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| package-lock.json | |
| node_modules |
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| // ECMAScript 5.1: | |
| /^(?!(?:do|if|in|for|let|new|try|var|case|else|enum|eval|null|this|true|void|with|break|catch|class|const|false|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$)(?:[\$A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u05D0-\u05EA\u05EF-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08BD\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1878\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1C80-\u1C88\u1C90-\u1CBA\u1CBD-\u1CBF\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FEF\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7B9\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA8FE\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC])(?:[\$0-9A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0300-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u0483-\u0487\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u05D0-\u05EA\u05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| // ECMAScript 6: | |
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|
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| // Note: run `npm install` first! | |
| 'use strict'; | |
| const fs = require('fs'); | |
| const regenerate = require('regenerate'); | |
| const template = require('lodash.template'); | |
| // Which Unicode version should be used? | |
| const version = '11.0.0'; | |
| // Set up a shorthand function to import Unicode data. | |
| const get = function(what) { | |
| return require(`unicode-${ version }/${ what }/code-points.js`); | |
| }; | |
| // Get the Unicode categories needed to construct the ES5 regex. | |
| const Lu = get('General_Category/Uppercase_Letter'); | |
| const Ll = get('General_Category/Lowercase_Letter'); | |
| const Lt = get('General_Category/Titlecase_Letter'); | |
| const Lm = get('General_Category/Modifier_Letter'); | |
| const Lo = get('General_Category/Other_Letter'); | |
| const Nl = get('General_Category/Letter_Number'); | |
| const Mn = get('General_Category/Nonspacing_Mark'); | |
| const Mc = get('General_Category/Spacing_Mark'); | |
| const Nd = get('General_Category/Decimal_Number'); | |
| const Pc = get('General_Category/Connector_Punctuation'); | |
| // Get the Unicode properties needed to construct the ES6 regex. | |
| const ID_Start = get('Binary_Property/ID_Start'); | |
| const ID_Continue = get('Binary_Property/ID_Continue'); | |
| const Other_ID_Start = get('Binary_Property/Other_ID_Start'); | |
| const compileRegex = template('/^(?!(?:<%= reservedWords %>)$)' + | |
| '(?:<%= identifierStart %>)(?:<%= identifierPart %>)*$/'); | |
| const generateES5Regex = function() { // ES 5.1 | |
| // https://mathiasbynens.be/notes/javascript-identifiers#valid-identifier-names | |
| const identifierStart = regenerate('$', '_') | |
| .add(Lu, Ll, Lt, Lm, Lo, Nl) | |
| .removeRange(0x010000, 0x10FFFF); // Remove astral symbols. | |
| const identifierPart = identifierStart.clone() | |
| .add('\u200C', '\u200D', Mn, Mc, Nd, Pc) | |
| .removeRange(0x010000, 0x10FFFF); // Remove astral symbols. | |
| const reservedWords = [ | |
| // https://mathiasbynens.be/notes/reserved-keywords#ecmascript-5 | |
| 'do', 'if', 'in', 'for', 'let', 'new', 'try', 'var', 'case', 'else', | |
| 'enum', 'eval', 'null', 'this', 'true', 'void', 'with', 'break', 'catch', | |
| 'class', 'const', 'false', 'super', 'throw', 'while', 'yield', 'delete', | |
| 'export', 'import', 'public', 'return', 'static', 'switch', 'typeof', | |
| 'default', 'extends', 'finally', 'package', 'private', 'continue', | |
| 'debugger', 'function', 'arguments', 'interface', 'protected', | |
| 'implements', 'instanceof', | |
| // These aren’t strictly reserved words, but they kind of behave as if | |
| // they were. | |
| //'NaN', 'Infinity', 'undefined' | |
| ]; | |
| const regex = compileRegex({ | |
| 'reservedWords': reservedWords.join('|'), | |
| 'identifierStart': identifierStart.toString(), | |
| 'identifierPart': identifierPart.toString() | |
| }); | |
| return regex; | |
| }; | |
| const generateES6Regex = function() { | |
| // http://ecma-international.org/ecma-262/6.0/#sec-identifier-names-static-semantics-early-errors | |
| // http://unicode.org/reports/tr31/#Default_Identifier_Syntax | |
| // https://bugs.ecmascript.org/show_bug.cgi?id=2717#c0 | |
| const identifierStart = regenerate(ID_Start) | |
| // Note: this already includes `Other_ID_Start`. http://git.io/wRCAfQ | |
| .add( | |
| '$', | |
| '_' | |
| ); | |
| const identifierPart = regenerate(ID_Continue) | |
| // Note: `ID_Continue` already includes `Other_ID_Continue`. http://git.io/wRCAfQ | |
| .add(Other_ID_Start) | |
| .add( | |
| '$', | |
| '_', | |
| '\u200C', | |
| '\u200D' | |
| ); | |
| const reservedWords = [ | |
| // https://mathiasbynens.be/notes/reserved-keywords#ecmascript-6 | |
| 'do', 'if', 'in', 'for', 'let', 'new', 'try', 'var', 'case', 'else', | |
| 'enum', 'eval', 'null', 'this', 'true', 'void', 'with', 'await', 'break', | |
| 'catch', 'class', 'const', 'false', 'super', 'throw', 'while', 'yield', | |
| 'delete', 'export', 'import', 'public', 'return', 'static', 'switch', | |
| 'typeof', 'default', 'extends', 'finally', 'package', 'private', | |
| 'continue', 'debugger', 'function', 'arguments', 'interface', 'protected', | |
| 'implements', 'instanceof', | |
| // These aren’t strictly reserved words, but they kind of behave as if | |
| // they were. | |
| //'NaN', 'Infinity', 'undefined' | |
| ]; | |
| const regex = compileRegex({ | |
| 'reservedWords': reservedWords.join('|'), | |
| 'identifierStart': identifierStart.toString(), | |
| 'identifierPart': identifierPart.toString() | |
| }); | |
| return regex; | |
| }; | |
| fs.writeFileSync( | |
| 'ecmascript-5.1.js', | |
| `// ECMAScript 5.1:\n\n${ generateES5Regex() }\n` | |
| ); | |
| fs.writeFileSync( | |
| 'ecmascript-6.js', | |
| `// ECMAScript 6:\n\n${ generateES6Regex() }\n` | |
| ); |
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| { | |
| "private": true, | |
| "scripts": { | |
| "build": "node javascript-identifier-regex.js" | |
| }, | |
| "dependencies": { | |
| "lodash.template": "^4.4.0", | |
| "regenerate": "^1.4.0", | |
| "unicode-11.0.0": "^0.7.7" | |
| } | |
| } |
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@mathiasbynens Much simpler! Thanks!