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<?php $val = 'dolphin-'; preg_match( $val, '[#1234] Subject', $matches); echo $matches[1]; // 1234
Output for 8.3.0 - 8.3.6
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
Output for 8.2.0 - 8.2.18
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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: preg_match(): Delimiter must not be alphanumeric or backslash 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 7.4.0 - 7.4.33
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3 Notice: Trying to access array offset on value of type null in /in/pkDFe on line 4
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3 Notice: Undefined offset: 1 in /in/pkDFe on line 4
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/pkDFe on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/pkDFe on line 3 Notice: Undefined offset: 1 in /in/pkDFe on line 4

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