我看到这篇文章：Regular expression to match non-English characters?，它允许你过滤掉外来的字符
str = str.replace(/[^\x00-\x7F]+/g, "");
我正在尝试允许这些字符，同时过滤掉特殊的字符，但允许'- _＆lt;＆lt;单引号，连字符，下划线和空格
问题：如何在这个javascript正则表达式中组合2允许外来字符？
str = str.replace(/[^a-zA-Z0-9'-_ ]/g, "");
假设我想要ü，不工作str = str.replace(/[^a-zA-Z0-9'-_ ü]/g, "");
答案 0 :(得分：2)
所以这非常复杂，因为无论你如何切片，你都要包含大量的Unicode字母或者要排除大量的Unicode特殊字符。你在这里需要的是一个正则表达式，它只允许Unicode general categories中的字符表示字母（Lu，Ll，Lt，Lm，Lo）。
在一些正则表达式中，内置了对Unicode常规类别的支持，您的正则表达式将类似于以下内容：
[\p{Ll}\p{Lu}\p{Lt}\p{Lm}\p{Lo}'\- _]
不幸的是，JavaScript不支持此功能，但您可以使用Unicode addon to the XRegExp library执行此操作，用法看起来像这样（用于过滤掉您不想要的所有字符）：
XRegExp.replace(text, "[^\\p{Ll}\\p{Lu}\\p{Lt}\\p{Lm}\\p{Lo}'\\- _]", '', 'all');
或者如果您想构建一个疯狂的长JavaScript正则表达式来完成这项工作，可以使用CSET JavaScript library，这是我提出的正则表达式：
var regex = /[\u0000-\u001f!-&(-,.-@[-^`{-©«-´¶-¹»-¿×÷˂-˅˒-˟˥-˫˭˯-\u036f͵\u0378-\u0379;-΅·\u038b\u038d\u03a2϶҂-\u0489\u0524-\u0530\u0557-\u0558՚-\u0560\u0588-\u05cf\u05eb-\u05ef׳-\u0620\u064b-٭\u0670۔\u06d6-\u06e4\u06e7-\u06ed۰-۹۽-۾܀-\u070f\u0711\u0730-\u074c\u07a6-\u07b0\u07b2-߉\u07eb-\u07f3߶-߹\u07fb-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962-॰\u0973-\u097a\u0980-\u0984\u098d-\u098e\u0991-\u0992\u09a9\u09b1\u09b3-\u09b5\u09ba-\u09bc\u09be-\u09cd\u09cf-\u09db\u09de\u09e2-৯৲-\u0a04\u0a0b-\u0a0e\u0a11-\u0a12\u0a29\u0a31\u0a34\u0a37\u0a3a-\u0a58\u0a5d\u0a5f-\u0a71\u0a75-\u0a84\u0a8e\u0a92\u0aa9\u0ab1\u0ab4\u0aba-\u0abc\u0abe-\u0acf\u0ad1-\u0adf\u0ae2-\u0b04\u0b0d-\u0b0e\u0b11-\u0b12\u0b29\u0b31\u0b34\u0b3a-\u0b3c\u0b3e-\u0b5b\u0b5e\u0b62-୰\u0b72-\u0b82\u0b84\u0b8b-\u0b8d\u0b91\u0b96-\u0b98\u0b9b\u0b9d\u0ba0-\u0ba2\u0ba5-\u0ba7\u0bab-\u0bad\u0bba-\u0bcf\u0bd1-\u0c04\u0c0d\u0c11\u0c29\u0c34\u0c3a-\u0c3c\u0c3e-\u0c57\u0c5a-\u0c5f\u0c62-\u0c84\u0c8d\u0c91\u0ca9\u0cb4\u0cba-\u0cbc\u0cbe-\u0cdd\u0cdf\u0ce2-\u0d04\u0d0d\u0d11\u0d29\u0d3a-\u0d3c\u0d3e-\u0d5f\u0d62-൹\u0d80-\u0d84\u0d97-\u0d99\u0db2\u0dbc\u0dbe-\u0dbf\u0dc7-\u0e00\u0e31\u0e34-฿\u0e47-\u0e80\u0e83\u0e85-\u0e86\u0e89\u0e8b-\u0e8c\u0e8e-\u0e93\u0e98\u0ea0\u0ea4\u0ea6\u0ea8-\u0ea9\u0eac\u0eb1\u0eb4-\u0ebc\u0ebe-\u0ebf\u0ec5\u0ec7-\u0edb\u0ede-\u0eff༁-\u0f3f\u0f48\u0f6d-\u0f87\u0f8c-\u0fff\u102b-\u103e၀-၏\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-႟\u10c6-\u10cf჻\u10fd-\u10ff\u115a-\u115e\u11a3-\u11a7\u11fa-\u11ff\u1249\u124e-\u124f\u1257\u1259\u125e-\u125f\u1289\u128e-\u128f\u12b1\u12b6-\u12b7\u12bf\u12c1\u12c6-\u12c7\u12d7\u1311\u1316-\u1317\u135b-\u137f᎐-\u139f\u13f5-\u1400᙭-᙮\u1677-\u1680᚛-\u169f᛫-\u16ff\u170d\u1712-\u171f\u1732-\u173f\u1752-\u175f\u176d\u1771-\u177f\u17b4-៖៘-៛\u17dd-\u181f\u1878-\u187f\u18a9\u18ab-\u18ff\u191d-᥏\u196e-\u196f\u1975-\u197f\u19aa-\u19c0\u19c8-᧿\u1a17-\u1b04\u1b34-\u1b44\u1b4c-\u1b82\u1ba1-\u1bad᮰-\u1bff\u1c24-\u1c4c᱐-᱙᱾-\u1cff\u1dc0-\u1dff\u1f16-\u1f17\u1f1e-\u1f1f\u1f46-\u1f47\u1f4e-\u1f4f\u1f58\u1f5a\u1f5c\u1f5e\u1f7e-\u1f7f\u1fb5᾽᾿-῁\u1fc5῍-῏\u1fd4-\u1fd5\u1fdc-῟῭-\u1ff1\u1ff5´-⁰\u2072-⁾₀-\u208f\u2095-℁℃-℆℈-℉℔№-℘℞-℣℥℧℩℮℺-℻⅀-⅄⅊-⅍⅏-\u2182\u2185-\u2bff\u2c2f\u2c5f\u2c70\u2c7e-\u2c7f⳥-⳿\u2d26-\u2d2f\u2d66-\u2d6e\u2d70-\u2d7f\u2d97-\u2d9f\u2da7\u2daf\u2db7\u2dbf\u2dc7\u2dcf\u2dd7\u2ddf-⸮⸰-〄\u3007-〰〶-\u303a〽-\u3040\u3097-゜゠・\u3100-\u3104\u312e-\u3130\u318f-㆟\u31b8-\u31ef㈀-㏿\u4db6-䷿\u9fc4-\u9fff\ua48d-\ua4ff꘍-꘏꘠-꘩\ua62c-\ua63f\ua660-\ua661\ua66f-꙾\ua698-꜖꜠-꜡꞉-꞊\ua78d-\ua7fa\ua802\ua806\ua80b\ua823-\ua83f꡴-\ua881\ua8b4-꤉\ua926-꤯\ua947-\ua9ff\uaa29-\uaa3f\uaa43\uaa4c-\uabff\ud7a4-\ud7ff\ud840-\ud868\udc00-\uf8ff\ufa2e-\ufa2f\ufa6b-\ufa6f\ufada-\ufaff\ufb07-\ufb12\ufb18-\ufb1c\ufb1e﬩\ufb37\ufb3d\ufb3f\ufb42\ufb45\ufbb2-\ufbd2﴾-\ufd4f\ufd90-\ufd91\ufdc8-\ufdef﷼-\ufe6f\ufe75\ufefd-＠［-｀｛-･\uffbf-\uffc1\uffc8-\uffc9\uffd0-\uffd1\uffd8-\uffd9\uffdd-\uffff]|[\ud803-\ud807\ud809-\ud834\ud836-\ud83f\ud86a-\ud87d\ud87f-\udbff][\udc00-\udfff]|\ud800[\udc0c\udc27\udc3b\udc3e\udc4e-\udc4f\udc5e-\udc7f\udcfb-\ude7f\ude9d-\ude9f\uded1-\udeff\udf1f-\udf2f\udf41\udf4a-\udf7f\udf9e-\udf9f\udfc4-\udfc7\udfd0-\udfff]|\ud801[\udc9e-\udfff]|\ud802[\udc06-\udc07\udc09\udc36\udc39-\udc3b\udc3d-\udc3e\udc40-\udcff\udd16-\udd1f\udd3a-\uddff\ude01-\ude0f\ude14\ude18\ude34-\udfff]|\ud808[\udf6f-\udfff]|\ud835[\udc55\udc9d\udca0-\udca1\udca3-\udca4\udca7-\udca8\udcad\udcba\udcbc\udcc4\udd06\udd0b-\udd0c\udd15\udd1d\udd3a\udd3f\udd45\udd47-\udd49\udd51\udea6-\udea7\udec1\udedb\udefb\udf15\udf35\udf4f\udf6f\udf89\udfa9\udfc3\udfcc-\udfff]|\ud869[\uded7-\udfff]|\ud87e[\ude1e-\udfff]|[\ud800-\ud83f\ud869-\udbff]/g;
到达那里的步骤（包括CSET来源之后）：
CSET.import();
var allUnicodeLetters = ['Lu', 'Ll', 'Lt', 'Lm', 'Lo'].map(fromUnicodeGeneralCategory).reduce(union);
var allAllowedCharacters = union(allUnicodeLetters, fromString("'- _"));
var regex = new RegExp(toRegex(complement(allAllowedCharacters)), 'g');
然后你可以使用str = str.replace(regex, '')它会删除所有特殊字符，除了你想要允许的字符，包括像dingbats这样的符号。
修改：刚刚意识到您可能还想允许数字，如果是这样，您可以使用以下内容，这是通过在上述方法中添加'Nd'和'Nl'获得的：
var regex = /[\u0000-\u001f!-&(-,.-/:-@[-^`{-©«-´¶-¹»-¿×÷˂-˅˒-˟˥-˫˭˯-\u036f͵\u0378-\u0379;-΅·\u038b\u038d\u03a2϶҂-\u0489\u0524-\u0530\u0557-\u0558՚-\u0560\u0588-\u05cf\u05eb-\u05ef׳-\u0620\u064b-\u065f٪-٭\u0670۔\u06d6-\u06e4\u06e7-\u06ed۽-۾܀-\u070f\u0711\u0730-\u074c\u07a6-\u07b0\u07b2-\u07bf\u07eb-\u07f3߶-߹\u07fb-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962-॥॰\u0973-\u097a\u0980-\u0984\u098d-\u098e\u0991-\u0992\u09a9\u09b1\u09b3-\u09b5\u09ba-\u09bc\u09be-\u09cd\u09cf-\u09db\u09de\u09e2-\u09e5৲-\u0a04\u0a0b-\u0a0e\u0a11-\u0a12\u0a29\u0a31\u0a34\u0a37\u0a3a-\u0a58\u0a5d\u0a5f-\u0a65\u0a70-\u0a71\u0a75-\u0a84\u0a8e\u0a92\u0aa9\u0ab1\u0ab4\u0aba-\u0abc\u0abe-\u0acf\u0ad1-\u0adf\u0ae2-\u0ae5\u0af0-\u0b04\u0b0d-\u0b0e\u0b11-\u0b12\u0b29\u0b31\u0b34\u0b3a-\u0b3c\u0b3e-\u0b5b\u0b5e\u0b62-\u0b65୰\u0b72-\u0b82\u0b84\u0b8b-\u0b8d\u0b91\u0b96-\u0b98\u0b9b\u0b9d\u0ba0-\u0ba2\u0ba5-\u0ba7\u0bab-\u0bad\u0bba-\u0bcf\u0bd1-\u0be5௰-\u0c04\u0c0d\u0c11\u0c29\u0c34\u0c3a-\u0c3c\u0c3e-\u0c57\u0c5a-\u0c5f\u0c62-\u0c65\u0c70-\u0c84\u0c8d\u0c91\u0ca9\u0cb4\u0cba-\u0cbc\u0cbe-\u0cdd\u0cdf\u0ce2-\u0ce5\u0cf0-\u0d04\u0d0d\u0d11\u0d29\u0d3a-\u0d3c\u0d3e-\u0d5f\u0d62-\u0d65൰-൹\u0d80-\u0d84\u0d97-\u0d99\u0db2\u0dbc\u0dbe-\u0dbf\u0dc7-\u0e00\u0e31\u0e34-฿\u0e47-๏๚-\u0e80\u0e83\u0e85-\u0e86\u0e89\u0e8b-\u0e8c\u0e8e-\u0e93\u0e98\u0ea0\u0ea4\u0ea6\u0ea8-\u0ea9\u0eac\u0eb1\u0eb4-\u0ebc\u0ebe-\u0ebf\u0ec5\u0ec7-\u0ecf\u0eda-\u0edb\u0ede-\u0eff༁-༟༪-\u0f3f\u0f48\u0f6d-\u0f87\u0f8c-\u0fff\u102b-\u103e၊-၏\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f\u109a-႟\u10c6-\u10cf჻\u10fd-\u10ff\u115a-\u115e\u11a3-\u11a7\u11fa-\u11ff\u1249\u124e-\u124f\u1257\u1259\u125e-\u125f\u1289\u128e-\u128f\u12b1\u12b6-\u12b7\u12bf\u12c1\u12c6-\u12c7\u12d7\u1311\u1316-\u1317\u135b-\u137f᎐-\u139f\u13f5-\u1400᙭-᙮\u1677-\u1680᚛-\u169f᛫-᛭\u16f1-\u16ff\u170d\u1712-\u171f\u1732-\u173f\u1752-\u175f\u176d\u1771-\u177f\u17b4-៖៘-៛\u17dd-\u17df\u17ea-\u180f\u181a-\u181f\u1878-\u187f\u18a9\u18ab-\u18ff\u191d-᥅\u196e-\u196f\u1975-\u197f\u19aa-\u19c0\u19c8-\u19cf\u19da-᧿\u1a17-\u1b04\u1b34-\u1b44\u1b4c-\u1b4f᭚-\u1b82\u1ba1-\u1bad\u1bba-\u1bff\u1c24-᰿\u1c4a-\u1c4c᱾-\u1cff\u1dc0-\u1dff\u1f16-\u1f17\u1f1e-\u1f1f\u1f46-\u1f47\u1f4e-\u1f4f\u1f58\u1f5a\u1f5c\u1f5e\u1f7e-\u1f7f\u1fb5᾽᾿-῁\u1fc5῍-῏\u1fd4-\u1fd5\u1fdc-῟῭-\u1ff1\u1ff5´-⁰\u2072-⁾₀-\u208f\u2095-℁℃-℆℈-℉℔№-℘℞-℣℥℧℩℮℺-℻⅀-⅄⅊-⅍⅏-⅟\u2189-\u2bff\u2c2f\u2c5f\u2c70\u2c7e-\u2c7f⳥-⳿\u2d26-\u2d2f\u2d66-\u2d6e\u2d70-\u2d7f\u2d97-\u2d9f\u2da7\u2daf\u2db7\u2dbf\u2dc7\u2dcf\u2dd7\u2ddf-⸮⸰-〄〈-〠\u302a-〰〶-〷〽-\u3040\u3097-゜゠・\u3100-\u3104\u312e-\u3130\u318f-㆟\u31b8-\u31ef㈀-㏿\u4db6-䷿\u9fc4-\u9fff\ua48d-\ua4ff꘍-꘏\ua62c-\ua63f\ua660-\ua661\ua66f-꙾\ua698-꜖꜠-꜡꞉-꞊\ua78d-\ua7fa\ua802\ua806\ua80b\ua823-\ua83f꡴-\ua881\ua8b4-꣏\ua8da-\ua8ff\ua926-꤯\ua947-\ua9ff\uaa29-\uaa3f\uaa43\uaa4c-\uaa4f\uaa5a-\uabff\ud7a4-\ud7ff\ud840-\ud868\udc00-\uf8ff\ufa2e-\ufa2f\ufa6b-\ufa6f\ufada-\ufaff\ufb07-\ufb12\ufb18-\ufb1c\ufb1e﬩\ufb37\ufb3d\ufb3f\ufb42\ufb45\ufbb2-\ufbd2﴾-\ufd4f\ufd90-\ufd91\ufdc8-\ufdef﷼-\ufe6f\ufe75\ufefd-／：-＠［-｀｛-･\uffbf-\uffc1\uffc8-\uffc9\uffd0-\uffd1\uffd8-\uffd9\uffdd-\uffff]|[\ud803-\ud807\ud80a-\ud834\ud836-\ud83f\ud86a-\ud87d\ud87f-\udbff][\udc00-\udfff]|\ud800[\udc0c\udc27\udc3b\udc3e\udc4e-\udc4f\udc5e-\udc7f\udcfb-\udd3f\udd75-\ude7f\ude9d-\ude9f\uded1-\udeff\udf1f-\udf2f\udf4b-\udf7f\udf9e-\udf9f\udfc4-\udfc7\udfd0\udfd6-\udfff]|\ud801[\udc9e-\udc9f\udcaa-\udfff]|\ud802[\udc06-\udc07\udc09\udc36\udc39-\udc3b\udc3d-\udc3e\udc40-\udcff\udd16-\udd1f\udd3a-\uddff\ude01-\ude0f\ude14\ude18\ude34-\udfff]|\ud808[\udf6f-\udfff]|\ud809[\udc63-\udfff]|\ud835[\udc55\udc9d\udca0-\udca1\udca3-\udca4\udca7-\udca8\udcad\udcba\udcbc\udcc4\udd06\udd0b-\udd0c\udd15\udd1d\udd3a\udd3f\udd45\udd47-\udd49\udd51\udea6-\udea7\udec1\udedb\udefb\udf15\udf35\udf4f\udf6f\udf89\udfa9\udfc3\udfcc-\udfcd]|\ud869[\uded7-\udfff]|\ud87e[\ude1e-\udfff]|[\ud800-\ud83f\ud869-\udbff]/g;
答案 1 :(得分：0)
JavaScript中的正则表达式没有unicode字符类，但您可以通过执行以下操作来自己包含/排除所有字符：
str = str.replace(/[!@#\$%\^&\*\(\)\{\}\?<>\+:;",\.\\]/g, "");
或使用像XRegExp
这样的库