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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match('\\#b' . preg_quote("like", '#') . '\\b#i', "I like tea"));
based on vPk2V
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/rhbpZ on line 3 bool(false)
Output for hhvm-3.15.4
Warning: Delimiter must not be alphanumeric or backslash in /in/rhbpZ on line 3 bool(false)