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<?php var_export(preg_match('~foo~', 'foo', $string)); var_export(preg_match('~foo~', 'bar', $string)); var_export(preg_match('~foo', 'foo', $string)); if (PREG_INTERNAL_ERROR === preg_last_error()) { echo "internal error\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
10 Warning: preg_match(): No ending delimiter '~' found in /in/32j3D on line 5 falseinternal error

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