标准化变音符是非常有用的

    const { normalize } = require('normalize-diacritics');
     
    /** Assuming top-level await is enabled... */
    await normalize('söme stüff with áccènts'); // 'some stuff with accents'

我把维基上的答案翻译成typescript静态类，供那些来自angular的人使用。

export class DiacriticsRemover {

  private static diacriticsMap: Map<string, string> = new Map<string, string>();

  private static defaultDiacriticsRemovalMap = [
    {
      base: 'A',
      letters: '\u0041\u24B6\uFF21\u00C0\u00C1\u00C2\u1EA6\u1EA4\u1EAA\u1EA8\u00C3\u0100\u0102\u1EB0\u1EAE\u1EB4\u1EB2\u0226\u01E0\u00C4\u01DE\u1EA2\u00C5\u01FA\u01CD\u0200\u0202\u1EA0\u1EAC\u1EB6\u1E00\u0104\u023A\u2C6F'
    },
    {
      base: 'AA',
      letters: '\uA732'
    },
    {
      base: 'AE',
      letters: '\u00C6\u01FC\u01E2'
    },
    {
      base: 'AO',
      letters: '\uA734'
    },
    {
      base: 'AU',
      letters: '\uA736'
    },
    {
      base: 'AV',
      letters: '\uA738\uA73A'
    },
    {
      base: 'AY',
      letters: '\uA73C'
    },
    {
      base: 'B',
      letters: '\u0042\u24B7\uFF22\u1E02\u1E04\u1E06\u0243\u0182\u0181'
    },
    {
      base: 'C',
      letters: '\u0043\u24B8\uFF23\u0106\u0108\u010A\u010C\u00C7\u1E08\u0187\u023B\uA73E'
    },
    {
      base: 'D',
      letters: '\u0044\u24B9\uFF24\u1E0A\u010E\u1E0C\u1E10\u1E12\u1E0E\u0110\u018B\u018A\u0189\uA779\u00D0'
    },
    {
      base: 'DZ',
      letters: '\u01F1\u01C4'
    },
    {
      base: 'Dz',
      letters: '\u01F2\u01C5'
    },
    {
      base: 'E',
      letters: '\u0045\u24BA\uFF25\u00C8\u00C9\u00CA\u1EC0\u1EBE\u1EC4\u1EC2\u1EBC\u0112\u1E14\u1E16\u0114\u0116\u00CB\u1EBA\u011A\u0204\u0206\u1EB8\u1EC6\u0228\u1E1C\u0118\u1E18\u1E1A\u0190\u018E'
    },
    {
      base: 'F',
      letters: '\u0046\u24BB\uFF26\u1E1E\u0191\uA77B'
    },
    {
      base: 'G',
      letters: '\u0047\u24BC\uFF27\u01F4\u011C\u1E20\u011E\u0120\u01E6\u0122\u01E4\u0193\uA7A0\uA77D\uA77E'
    },
    {
      base: 'H',
      letters: '\u0048\u24BD\uFF28\u0124\u1E22\u1E26\u021E\u1E24\u1E28\u1E2A\u0126\u2C67\u2C75\uA78D'
    },
    {
      base: 'I',
      letters: '\u0049\u24BE\uFF29\u00CC\u00CD\u00CE\u0128\u012A\u012C\u0130\u00CF\u1E2E\u1EC8\u01CF\u0208\u020A\u1ECA\u012E\u1E2C\u0197'
    },
    {
      base: 'J',
      letters: '\u004A\u24BF\uFF2A\u0134\u0248'
    },
    {
      base: 'K',
      letters: '\u004B\u24C0\uFF2B\u1E30\u01E8\u1E32\u0136\u1E34\u0198\u2C69\uA740\uA742\uA744\uA7A2'
    },
    {
      base: 'L',
      letters: '\u004C\u24C1\uFF2C\u013F\u0139\u013D\u1E36\u1E38\u013B\u1E3C\u1E3A\u0141\u023D\u2C62\u2C60\uA748\uA746\uA780'
    },
    {
      base: 'LJ',
      letters: '\u01C7'
    },
    {
      base: 'Lj',
      letters: '\u01C8'
    },
    {
      base: 'M',
      letters: '\u004D\u24C2\uFF2D\u1E3E\u1E40\u1E42\u2C6E\u019C'
    },
    {
      base: 'N',
      letters: '\u004E\u24C3\uFF2E\u01F8\u0143\u00D1\u1E44\u0147\u1E46\u0145\u1E4A\u1E48\u0220\u019D\uA790\uA7A4'
    },
    {
      base: 'NJ',
      letters: '\u01CA'
    },
    {
      base: 'Nj',
      letters: '\u01CB'
    },
    {
      base: 'O',
      letters: '\u004F\u24C4\uFF2F\u00D2\u00D3\u00D4\u1ED2\u1ED0\u1ED6\u1ED4\u00D5\u1E4C\u022C\u1E4E\u014C\u1E50\u1E52\u014E\u022E\u0230\u00D6\u022A\u1ECE\u0150\u01D1\u020C\u020E\u01A0\u1EDC\u1EDA\u1EE0\u1EDE\u1EE2\u1ECC\u1ED8\u01EA\u01EC\u00D8\u01FE\u0186\u019F\uA74A\uA74C'
    },
    {
      base: 'OI',
      letters: '\u01A2'
    },
    {
      base: 'OO',
      letters: '\uA74E'
    },
    {
      base: 'OU',
      letters: '\u0222'
    },
    {
      base: 'OE',
      letters: '\u008C\u0152'
    },
    {
      base: 'oe',
      letters: '\u009C\u0153'
    },
    {
      base: 'P',
      letters: '\u0050\u24C5\uFF30\u1E54\u1E56\u01A4\u2C63\uA750\uA752\uA754'
    },
    {
      base: 'Q',
      letters: '\u0051\u24C6\uFF31\uA756\uA758\u024A'
    },
    {
      base: 'R',
      letters: '\u0052\u24C7\uFF32\u0154\u1E58\u0158\u0210\u0212\u1E5A\u1E5C\u0156\u1E5E\u024C\u2C64\uA75A\uA7A6\uA782'
    },
    {
      base: 'S',
      letters: '\u0053\u24C8\uFF33\u1E9E\u015A\u1E64\u015C\u1E60\u0160\u1E66\u1E62\u1E68\u0218\u015E\u2C7E\uA7A8\uA784'
    },
    {
      base: 'T',
      letters: '\u0054\u24C9\uFF34\u1E6A\u0164\u1E6C\u021A\u0162\u1E70\u1E6E\u0166\u01AC\u01AE\u023E\uA786'
    },
    {
      base: 'TZ',
      letters: '\uA728'
    },
    {
      base: 'U',
      letters: '\u0055\u24CA\uFF35\u00D9\u00DA\u00DB\u0168\u1E78\u016A\u1E7A\u016C\u00DC\u01DB\u01D7\u01D5\u01D9\u1EE6\u016E\u0170\u01D3\u0214\u0216\u01AF\u1EEA\u1EE8\u1EEE\u1EEC\u1EF0\u1EE4\u1E72\u0172\u1E76\u1E74\u0244'
    },
    {
      base: 'V',
      letters: '\u0056\u24CB\uFF36\u1E7C\u1E7E\u01B2\uA75E\u0245'
    },
    {
      base: 'VY',
      letters: '\uA760'
    },
    {
      base: 'W',
      letters: '\u0057\u24CC\uFF37\u1E80\u1E82\u0174\u1E86\u1E84\u1E88\u2C72'
    },
    {
      base: 'X',
      letters: '\u0058\u24CD\uFF38\u1E8A\u1E8C'
    },
    {
      base: 'Y',
      letters: '\u0059\u24CE\uFF39\u1EF2\u00DD\u0176\u1EF8\u0232\u1E8E\u0178\u1EF6\u1EF4\u01B3\u024E\u1EFE'
    },
    {
      base: 'Z',
      letters: '\u005A\u24CF\uFF3A\u0179\u1E90\u017B\u017D\u1E92\u1E94\u01B5\u0224\u2C7F\u2C6B\uA762'
    },
    {
      base: 'a',
      letters: '\u0061\u24D0\uFF41\u1E9A\u00E0\u00E1\u00E2\u1EA7\u1EA5\u1EAB\u1EA9\u00E3\u0101\u0103\u1EB1\u1EAF\u1EB5\u1EB3\u0227\u01E1\u00E4\u01DF\u1EA3\u00E5\u01FB\u01CE\u0201\u0203\u1EA1\u1EAD\u1EB7\u1E01\u0105\u2C65\u0250'
    },
    {
      base: 'aa',
      letters: '\uA733'
    },
    {
      base: 'ae',
      letters: '\u00E6\u01FD\u01E3'
    },
    {
      base: 'ao',
      letters: '\uA735'
    },
    {
      base: 'au',
      letters: '\uA737'
    },
    {
      base: 'av',
      letters: '\uA739\uA73B'
    },
    {
      base: 'ay',
      letters: '\uA73D'
    },
    {
      base: 'b',
      letters: '\u0062\u24D1\uFF42\u1E03\u1E05\u1E07\u0180\u0183\u0253'
    },
    {
      base: 'c',
      letters: '\u0063\u24D2\uFF43\u0107\u0109\u010B\u010D\u00E7\u1E09\u0188\u023C\uA73F\u2184'
    },
    {
      base: 'd',
      letters: '\u0064\u24D3\uFF44\u1E0B\u010F\u1E0D\u1E11\u1E13\u1E0F\u0111\u018C\u0256\u0257\uA77A'
    },
    {
      base: 'dz',
      letters: '\u01F3\u01C6'
    },
    {
      base: 'e',
      letters: '\u0065\u24D4\uFF45\u00E8\u00E9\u00EA\u1EC1\u1EBF\u1EC5\u1EC3\u1EBD\u0113\u1E15\u1E17\u0115\u0117\u00EB\u1EBB\u011B\u0205\u0207\u1EB9\u1EC7\u0229\u1E1D\u0119\u1E19\u1E1B\u0247\u025B\u01DD'
    },
    {
      base: 'f',
      letters: '\u0066\u24D5\uFF46\u1E1F\u0192\uA77C'
    },
    {
      base: 'g',
      letters: '\u0067\u24D6\uFF47\u01F5\u011D\u1E21\u011F\u0121\u01E7\u0123\u01E5\u0260\uA7A1\u1D79\uA77F'
    },
    {
      base: 'h',
      letters: '\u0068\u24D7\uFF48\u0125\u1E23\u1E27\u021F\u1E25\u1E29\u1E2B\u1E96\u0127\u2C68\u2C76\u0265'
    },
    {
      base: 'hv',
      letters: '\u0195'
    },
    {
      base: 'i',
      letters: '\u0069\u24D8\uFF49\u00EC\u00ED\u00EE\u0129\u012B\u012D\u00EF\u1E2F\u1EC9\u01D0\u0209\u020B\u1ECB\u012F\u1E2D\u0268\u0131'
    },
    {
      base: 'j',
      letters: '\u006A\u24D9\uFF4A\u0135\u01F0\u0249'
    },
    {
      base: 'k',
      letters: '\u006B\u24DA\uFF4B\u1E31\u01E9\u1E33\u0137\u1E35\u0199\u2C6A\uA741\uA743\uA745\uA7A3'
    },
    {
      base: 'l',
      letters: '\u006C\u24DB\uFF4C\u0140\u013A\u013E\u1E37\u1E39\u013C\u1E3D\u1E3B\u017F\u0142\u019A\u026B\u2C61\uA749\uA781\uA747'
    },
    {
      base: 'lj',
      letters: '\u01C9'
    },
    {
      base: 'm',
      letters: '\u006D\u24DC\uFF4D\u1E3F\u1E41\u1E43\u0271\u026F'
    },
    {
      base: 'n',
      letters: '\u006E\u24DD\uFF4E\u01F9\u0144\u00F1\u1E45\u0148\u1E47\u0146\u1E4B\u1E49\u019E\u0272\u0149\uA791\uA7A5'
    },
    {
      base: 'nj',
      letters: '\u01CC'
    },
    {
      base: 'o',
      letters: '\u006F\u24DE\uFF4F\u00F2\u00F3\u00F4\u1ED3\u1ED1\u1ED7\u1ED5\u00F5\u1E4D\u022D\u1E4F\u014D\u1E51\u1E53\u014F\u022F\u0231\u00F6\u022B\u1ECF\u0151\u01D2\u020D\u020F\u01A1\u1EDD\u1EDB\u1EE1\u1EDF\u1EE3\u1ECD\u1ED9\u01EB\u01ED\u00F8\u01FF\u0254\uA74B\uA74D\u0275'
    },
    {
      base: 'oi',
      letters: '\u01A3'
    },
    {
      base: 'ou',
      letters: '\u0223'
    },
    {
      base: 'oo',
      letters: '\uA74F'
    },
    {
      base: 'p',
      letters: '\u0070\u24DF\uFF50\u1E55\u1E57\u01A5\u1D7D\uA751\uA753\uA755'
    },
    {
      base: 'q',
      letters: '\u0071\u24E0\uFF51\u024B\uA757\uA759'
    },
    {
      base: 'r',
      letters: '\u0072\u24E1\uFF52\u0155\u1E59\u0159\u0211\u0213\u1E5B\u1E5D\u0157\u1E5F\u024D\u027D\uA75B\uA7A7\uA783'
    },
    {
      base: 's',
      letters: '\u0073\u24E2\uFF53\u00DF\u015B\u1E65\u015D\u1E61\u0161\u1E67\u1E63\u1E69\u0219\u015F\u023F\uA7A9\uA785\u1E9B'
    },
    {
      base: 't',
      letters: '\u0074\u24E3\uFF54\u1E6B\u1E97\u0165\u1E6D\u021B\u0163\u1E71\u1E6F\u0167\u01AD\u0288\u2C66\uA787'
    },
    {
      base: 'tz',
      letters: '\uA729'
    },
    {
      base: 'u',
      letters: '\u0075\u24E4\uFF55\u00F9\u00FA\u00FB\u0169\u1E79\u016B\u1E7B\u016D\u00FC\u01DC\u01D8\u01D6\u01DA\u1EE7\u016F\u0171\u01D4\u0215\u0217\u01B0\u1EEB\u1EE9\u1EEF\u1EED\u1EF1\u1EE5\u1E73\u0173\u1E77\u1E75\u0289'
    },
    {
      base: 'v',
      letters: '\u0076\u24E5\uFF56\u1E7D\u1E7F\u028B\uA75F\u028C'
    },
    {
      base: 'vy',
      letters: '\uA761'
    },
    {
      base: 'w',
      letters: '\u0077\u24E6\uFF57\u1E81\u1E83\u0175\u1E87\u1E85\u1E98\u1E89\u2C73'
    },
    {
      base: 'x',
      letters: '\u0078\u24E7\uFF58\u1E8B\u1E8D'
    },
    {
      base: 'y',
      letters: '\u0079\u24E8\uFF59\u1EF3\u00FD\u0177\u1EF9\u0233\u1E8F\u00FF\u1EF7\u1E99\u1EF5\u01B4\u024F\u1EFF'
    },
    {
      base: 'z',
      letters: '\u007A\u24E9\uFF5A\u017A\u1E91\u017C\u017E\u1E93\u1E95\u01B6\u0225\u0240\u2C6C\uA763'
    }
  ];

  private static isSetUp = false;

  public static removeDiacritics(text: string): string {
    if (!this.isSetUp) {
      this.setUp();
    }

    return text.replace(/[^\u0000-\u007E]/g, (a: string) => this.diacriticsMap.get(a) || a);
  }

  private static setUp(): void {
    // tslint:disable-next-line:prefer-for-of
    for (let i = 0; i < this.defaultDiacriticsRemovalMap.length; i++) {
      const letters = this.defaultDiacriticsRemovalMap[i].letters;

      // tslint:disable-next-line:prefer-for-of
      for (let j = 0; j < letters.length; j++) {
        this.diacriticsMap.set(letters[j], this.defaultDiacriticsRemovalMap[i].base);
      }
    }
    this.isSetUp = true;
  }
}

新RegExp的格式为

RegExp(something, 'modifiers');

所以你会想

accentsTidy = function(s){
                        var r=s.toLowerCase();
                        r = r.replace(new RegExp("\\s", 'g'),"");
                        r = r.replace(new RegExp("[àáâãäå]", 'g'),"a");
                        r = r.replace(new RegExp("æ", 'g'),"ae");
                        r = r.replace(new RegExp("ç", 'g'),"c");
                        r = r.replace(new RegExp("[èéêë]", 'g'),"e");
                        r = r.replace(new RegExp("[ìíîï]", 'g'),"i");
                        r = r.replace(new RegExp("ñ", 'g'),"n");                            
                        r = r.replace(new RegExp("[òóôõö]", 'g'),"o");
                        r = r.replace(new RegExp("œ", 'g'),"oe");
                        r = r.replace(new RegExp("[ùúûü]", 'g'),"u");
                        r = r.replace(new RegExp("[ýÿ]", 'g'),"y");
                        r = r.replace(new RegExp("\\W", 'g'),"");
                        return r;
                };

标准化变音符是非常有用的

    const { normalize } = require('normalize-diacritics');
     
    /** Assuming top-level await is enabled... */
    await normalize('söme stüff with áccènts'); // 'some stuff with accents'

你可以用多种方式创建正则表达式。使用新的regexp -构造函数:

var re = new RegExp("[a-z]", "ig") //(string pattern, string modifiers)

或者使用正则表达式文字表示法:

var re = /[a-z]/ig; // /pattern/modifiers

你把两者混在一起了。

这里有一个非常简单的解决方案，没有太多的代码，使用一个非常简单的变音符的映射，其中包括一些或全部映射到包含多个字符的ascii等价物，即Æ => AE, ffi => ffi，等等…还包括一些非常基本的功能测试

var diacriticsMap = {
  '\u00C0': 'A',  // À => A
  '\u00C1': 'A',   // Á => A
  '\u00C2': 'A',   // Â => A
  '\u00C3': 'A',   // Ã => A
  '\u00C4': 'A',   // Ä => A
  '\u00C5': 'A',   // Å => A
  '\u00C6': 'AE', // Æ => AE
  '\u00C7': 'C',   // Ç => C
  '\u00C8': 'E',   // È => E
  '\u00C9': 'E',   // É => E
  '\u00CA': 'E',   // Ê => E
  '\u00CB': 'E',   // Ë => E
  '\u00CC': 'I',   // Ì => I
  '\u00CD': 'I',   // Í => I
  '\u00CE': 'I',   // Î => I
  '\u00CF': 'I',   // Ï => I
  '\u0132': 'IJ', // IJ => IJ
  '\u00D0': 'D',   // Ð => D
  '\u00D1': 'N',   // Ñ => N
  '\u00D2': 'O',   // Ò => O
  '\u00D3': 'O',   // Ó => O
  '\u00D4': 'O',   // Ô => O
  '\u00D5': 'O',   // Õ => O
  '\u00D6': 'O',   // Ö => O
  '\u00D8': 'O',   // Ø => O
  '\u0152': 'OE', // Π=> OE
  '\u00DE': 'TH', // Þ => TH
  '\u00D9': 'U',   // Ù => U
  '\u00DA': 'U',   // Ú => U
  '\u00DB': 'U',   // Û => U
  '\u00DC': 'U',   // Ü => U
  '\u00DD': 'Y',   // Ý => Y
  '\u0178': 'Y',   // Ÿ => Y
  '\u00E0': 'a',   // à => a
  '\u00E1': 'a',   // á => a
  '\u00E2': 'a',   // â => a
  '\u00E3': 'a',   // ã => a
  '\u00E4': 'a',   // ä => a
  '\u00E5': 'a',   // å => a
  '\u00E6': 'ae', // æ => ae
  '\u00E7': 'c',   // ç => c
  '\u00E8': 'e',   // è => e
  '\u00E9': 'e',   // é => e
  '\u00EA': 'e',   // ê => e
  '\u00EB': 'e',   // ë => e
  '\u00EC': 'i',   // ì => i
  '\u00ED': 'i',   // í => i
  '\u00EE': 'i',   // î => i
  '\u00EF': 'i',   // ï => i
  '\u0133': 'ij', // ij => ij
  '\u00F0': 'd',   // ð => d
  '\u00F1': 'n',   // ñ => n
  '\u00F2': 'o',   // ò => o
  '\u00F3': 'o',   // ó => o
  '\u00F4': 'o',   // ô => o
  '\u00F5': 'o',   // õ => o
  '\u00F6': 'o',   // ö => o
  '\u00F8': 'o',   // ø => o
  '\u0153': 'oe', // œ => oe
  '\u00DF': 'ss', // ß => ss
  '\u00FE': 'th', // þ => th
  '\u00F9': 'u',   // ù => u
  '\u00FA': 'u',   // ú => u
  '\u00FB': 'u',   // û => u
  '\u00FC': 'u',   // ü => u
  '\u00FD': 'y',   // ý => y
  '\u00FF': 'y',   // ÿ => y
  '\uFB00': 'ff', // ff => ff
  '\uFB01': 'fi',   // fi => fi
  '\uFB02': 'fl', // fl => fl
  '\uFB03': 'ffi',  // ffi => ffi
  '\uFB04': 'ffl',  // ffl => ffl
  '\uFB05': 'ft', // ſt => ft
  '\uFB06': 'st'  // st => st
};

function replaceDiacritics(str) {
  var returnStr = '';
  if(str) {
    for (var i = 0; i < str.length; i++) {
      if (diacriticsMap[str[i]]) {
        returnStr += diacriticsMap[str[i]];
      } else {
        returnStr += str[i];
      }
    }
  }
  return returnStr;
}

function testStripDiacritics(input, expected) {
  var coChar = replaceDiacritics(input);
  console.log('The character passed in was ' + input);
  console.log('The character that came out was ' + coChar);
  console.log('The character expected was' + expected);
}

testStripDiacritics('À','A');
testStripDiacritics('A','A');
testStripDiacritics('Æ','AE');
testStripDiacritics('AE','AE');
testStripDiacritics('ÇhÀrlËšYŸZŽ','ChArlEsYYZZ');