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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 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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
Output for 8.0.0 - 8.0.30
Warning: Undefined variable $letter in /in/jV1h1 on line 5 There are allowed symbols in the text
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: letter in /in/jV1h1 on line 5 There are allowed symbols in the text
Output for 7.3.32 - 7.3.33
There are allowed symbols in the text
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: letter in /in/jV1h1 on line 5 There are allowed symbols in the text
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224.1 ms | 402 KiB | 460 Q