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<?php $val = 'dolphin-'; preg_match( $val, '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for git.master, git.master_jit
Warning: preg_match(): Delimiter must not be alphanumeric, backslash, or NUL in /in/pkDFe on line 3 Warning: Trying to access array offset on value of type null in /in/pkDFe on line 4
Output for rfc.property-hooks
Warning: preg_match(): Delimiter must not be alphanumeric, backslash, or NUL in /in/pkDFe on line 3 Warning: Trying to access array offset on null in /in/pkDFe on line 4

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