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POHow to remove invalid UTF-8 characters from a JavaScript string?
 

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  1. POHow to remove invalid UTF-8 characters from a JavaScript string?
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    <p>I'd like to remove all invalid UTF-8 characters from a string in JavaScript. I've tried with this JavaScript:</p> <p><code>strTest = strTest.replace(/([\x00-\x7F]|[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3})|./g, "$1"); </code></p> <p>It seems that the UTF-8 validation regex described here <em>(link removed)</em> is more complete and I adapted it in the same way like:</p> <p><code>strTest = strTest.replace(/([\x09\x0A\x0D\x20-\x7E]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF][\x80-\xBF]{2}|[\xF1-\xF3][\x80-\xBF]{3}|\xF4[\x80-\x8F][\x80-\xBF]{2})|./g, "$1"); </code></p> <p>Both of these pieces of code seem to be allowing valid UTF-8 through, but aren't filtering out hardly any of the bad UTF-8 characters from my test data: <a href="http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt" rel="noreferrer">UTF-8 decoder capability and stress test</a>. Either the bad characters come through unchanged or seem to have some of their bytes removed creating a new, invalid character.</p> <p>I'm not very familiar with the UTF-8 standard or with multibyte in JavaScript so I'm not sure if I'm failing to represent proper UTF-8 in the regex or if I'm applying that regex improperly in JavaScript.</p> <p>Edit: added global flag to my regex per Tomalak's comment - however this still isn't working for me. I'm abandoning doing this on the client side per bobince's comment.</p>
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    1. USMatthew Sielski
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    1. COMissing links: link 1 - http://stackoverflow.com/questions/1401317/remove-non-uft8-characters-from-string link 2 - http://www.w3.org/International/questions/qa-forms-utf-8
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