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<?php $not_allowed_symbols = '[^a-z0-9:;,!\'\s*.?()"-]'; //$letter = nl2br("aaa\nbbb\nccc"); //print_r($letter); if(preg_match("/$not_allowed_symbols/i", $letter)){ echo "There are not allowed symbols in the text"; }else{ echo "There are allowed symbols in the text"; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $letter in /in/jV1h1 on line 5 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/jV1h1 on line 5 There are allowed symbols in the text

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