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<?php $not_allowed_symbols = '[^a-z0-9:;,!\'\s*.?()"-]'; $letter = nl2br("aaa\nbbb\nccc"); if(preg_match("/$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
There are not allowed symbols in the text

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