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POCombining multiple regular expressions into one
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  1. POCombining multiple regular expressions into one
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    copied!<p>I'm filtering all user input to remove the following characters: <a href="http://www.w3.org/TR/unicode-xml/#Charlist" rel="nofollow">http://www.w3.org/TR/unicode-xml/#Charlist</a> ("not suitable characters for use with markup"). So, I have this two functions:</p> <hr> <pre><code>if (!function_exists("mb_trim")) { function mb_trim($str) { return preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $str); } } </code></pre> <hr> <pre><code>function sanitize($str) { // Clones of grave and accent $str = preg_replace("/[\x{0340}-\x{0341}]+/u", "", $str); // Obsolete characters for Khmer $str = preg_replace("/[\x{17A3}]+/u", "", $str); $str = preg_replace("/[\x{17D3}]+/u", "", $str); // Line and paragraph separator $str = preg_replace("/[\x{2028}]+/u", "", $str); $str = preg_replace("/[\x{2029}]+/u", "", $str); // BIDI embedding controls (LRE, RLE, LRO, RLO, PDF) $str = preg_replace("/[\x{202A}-\x{202E}]+/u", "", $str); // Activate/Inhibit Symmetric swapping $str = preg_replace("/[\x{206A}-\x{206B}]+/u", "", $str); // Activate/Inhibit Arabic from shaping $str = preg_replace("/[\x{206C}-\x{206D}]+/u", "", $str); // Activate/Inhibit National digit shapes $str = preg_replace("/[\x{206E}-\x{206F}]+/u", "", $str); // Interlinear annotation characters $str = preg_replace("/[\x{FFF9}-\x{FFFB}]+/u", "", $str); // Byte Order Mark $str = preg_replace("/[\x{FEFF}]+/u", "", $str); // Object replacement character $str = preg_replace("/[\x{FFFC}]+/u", "", $str); // Scoping for Musical Notation $str = preg_replace("/[\x{1D173}-\x{1D17A}]+/u", "", $str); $str = mb_trim($str); if (mb_check_encoding($str)) { return $str; } else { return false; } } </code></pre> <hr> <p>I have not much knowledge with regular expresions, so, what I want to know is</p> <ul> <li>Is the <strong>mb_trim</strong> function correct for trimming multi-byte strings?</li> <li>Is it possible to join all regular expresions in the function <strong>sanitize</strong> to do only one preg_replace?</li> </ul> <p>Thanks</p>
 

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