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    <p>Regular Expressions in <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" rel="nofollow noreferrer">ECMAScript</a> implementations are IMHO best explained at the <a href="https://developer.mozilla.org/" rel="nofollow noreferrer">Mozilla Developer Network (formerly, Mozilla Developer Center)</a> in the <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/RegExp" rel="nofollow noreferrer"><code>RegExp</code> article</a> of the <a href="https://developer.mozilla.org/en/JavaScript/Reference/" rel="nofollow noreferrer">JavaScript Language Reference</a> pp.</p> <p>However, as noted, the previous answers do not take <em>non-English</em> letters into account, such as umlauts and accented letters. In order not to remove those letters from the string, you have to exclude them from the character range like so:</p> <pre><code>var s = "Victor 1 jagt 2 zwölf 3 Boxkämpfer 4 quer 5 über 6 den 7 Sylter 8 Deich"; s = s.replace(/[^a-zäöüß]+/gi, ""); </code></pre> <p>This approach quickly becomes tedious and hard to maintain, especially if <em>several</em> natural languages need to be considered (and even in proper English there are foreign words like "<em>déjà vu</em>" and "<em>fiancé</em>"). </p> <p>Therefore, among other <a href="http://www.pcre.org/" rel="nofollow noreferrer">PCRE</a> features, <a href="http://pointedears.de/websvn/filedetails.php?repname=JSX&amp;path=%2Ftrunk%2Fregexp.js" rel="nofollow noreferrer">JSX:regexp.js</a> lets you use Regular Expressions that can use Unicode property classes, through the <a href="http://unicode.org/ucd/" rel="nofollow noreferrer">Unicode Character Database (UCD)</a>.</p> <p>You would then write¹</p> <pre><code>var s = "Victor 1 jagt 2 zwölf 3 Boxkämpfer 4 quer 5 über 6 den 7 Sylter 8 Deich"; var rxNotLetter = new jsx.regexp.RegExp("\\P{Ll}+", "gi"); s = s.replace(rxNotLetter, ""); </code></pre> <p>or</p> <pre><code>var s = "El 1 veloz 2 murciélago 3 hindú 4 comía 5 feliz 6 cardillo 7 y 8 kiwi. La cigüeña tocaba el saxofón detrás del palenque de paja" + " – Съешь 1 же 2 ещё 3 этих 4 мягких 5 французских 6 булок, да 7 выпей 8 чаю."; var rxNotLetterOrWhitespace = new jsx.regexp.RegExp("[^\\p{Ll}\\p{Lu}\\s]+", "g"); s = s.replace(rxNotLetterOrWhitespace, ""); </code></pre> <p>to reduce dependency on the uppercase/lowercase quirks of implementations (and be more extensible), for a <code>RegExp</code> that excludes all non-letter Unicode characters (and white-space in the second example).</p> <p><a href="http://PointedEars.de/scripts/test/regexp" rel="nofollow noreferrer">Testcase</a></p> <p>Be sure to provide a version of the Unicode Character Database as well, because it is large, in flux, and therefore not built into regexp.js (JSX contains a verbose text and compacted script version of the UCD; both can be used, and the latter is preferred, by regexp.js). Note that <a href="http://ecma-international.org/ecma-262/5.1/#sec-2" rel="nofollow noreferrer">a conforming ECMAScript implementation does not need to support characters beyond the Basic Multilingual Plane (U+0000 to U+FFFF)</a>, so <code>jsx.regexp.RegExp</code> currently cannot support those even though they are in the UCD. See the documentation in the source code for details.</p> <p>¹ <a href="http://en.wikipedia.org/wiki/Pangram" rel="nofollow noreferrer">Pangrams</a> from <a href="http://wikipedia.org/" rel="nofollow noreferrer">Wikipedia</a>, the free encyclopedia.</p>
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    1. COUpvoted. This is a must if there are non english characters!
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