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    <p>The charset doesn't matter. The allowed characters matters more. Check the <a href="http://www.w3.org/TR/CSS2/syndata.html#characters" rel="noreferrer">CSS specification</a>. Here's a cite of relevance:</p> <blockquote> <p>In CSS, identifiers (including element names, classes, and IDs in <a href="http://www.w3.org/TR/CSS2/selector.html" rel="noreferrer">selectors</a>) can contain only the characters <code>[a-zA-Z0-9]</code> and ISO 10646 characters <code>U+00A1</code> and higher, plus the hyphen (<code>-</code>) and the underscore (<code>_</code>); they cannot start with a digit, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code (see next item). For instance, the identifier <code>"B&amp;W?"</code> may be written as <code>"B\&amp;W\?"</code> or <code>"B\26 W\3F"</code>.</p> </blockquote> <p><strong>Update</strong>: As to the regex question, you can find the grammar <a href="http://www.w3.org/TR/CSS21/grammar.html#scanner" rel="noreferrer">here</a>:</p> <pre><code>ident -?{nmstart}{nmchar}* </code></pre> <p>Which contains of the parts:</p> <pre><code>nmstart [_a-z]|{nonascii}|{escape} nmchar [_a-z0-9-]|{nonascii}|{escape} nonascii [\240-\377] escape {unicode}|\\[^\r\n\f0-9a-f] unicode \\{h}{1,6}(\r\n|[ \t\r\n\f])? h [0-9a-f] </code></pre> <p>This can be translated to a Java regex as follows (I only added parentheses to parts containing the OR and escaped the backslashes):</p> <pre><code>String h = "[0-9a-f]"; String unicode = "\\\\{h}{1,6}(\\r\\n|[ \\t\\r\\n\\f])?".replace("{h}", h); String escape = "({unicode}|\\\\[^\\r\\n\\f0-9a-f])".replace("{unicode}", unicode); String nonascii = "[\\240-\\377]"; String nmchar = "([_a-z0-9-]|{nonascii}|{escape})".replace("{nonascii}", nonascii).replace("{escape}", escape); String nmstart = "([_a-z]|{nonascii}|{escape})".replace("{nonascii}", nonascii).replace("{escape}", escape); String ident = "-?{nmstart}{nmchar}*".replace("{nmstart}", nmstart).replace("{nmchar}", nmchar); System.out.println(ident); // The full regex. </code></pre> <p><strong>Update 2</strong>: oh, you're more a PHP'er, well I think you can figure how/where to do <code>str_replace</code>? </p>
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    1. POAllowed characters for CSS identifiers
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    1. CO"the identifier "B&W?" may be written as "B\&W\?" or "B\26 W\3F"" - But nobody does that, and I'm glad they don't. :-)
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    2. COTHANK YOU! That's just awesome! :D I though it was very limited but didn't knew I could use `\` as an escape character. Has anyone ever built a regex to validate the allowed chars?
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    3. COThat's perfect, and yes I can figure it out. =) Thanks again!
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