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<?php var_dump(PCRE_DOTTED_VERSION); $x=preg_match("%[=~]|<[>=]%", "test");
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant PCRE_DOTTED_VERSION - assumed 'PCRE_DOTTED_VERSION' in /in/egdJT on line 2 string(19) "PCRE_DOTTED_VERSION"