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<?php var_dump( preg_match('#(?:(.)\1{2,})#', 'xaaax') ); var_dump( preg_match('#(?:(.)\2{2,})#', 'xaaax') );
Output for git.master, git.master_jit, rfc.property-hooks
int(1) Warning: preg_match(): Compilation failed: reference to non-existent subpattern at offset 7 in /in/mlWDo on line 5 bool(false)

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