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run code in 200+ php & hhvm versions
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<?php $input = 'PHP'; $data = 'Programmeringsspråk: PHP'; $pattern = preg_quote($input, '/'); if (preg_match($pattern, $data)) { var_dump('rejoice!'); }
Output for 4.3.11 - 7.2.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/fAfLb on line 7
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/fAfLb on line 7