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<?php $test1 = '07511 111111'; $test2 = '+447511 111111'; $test3 = '+44 (0) 7511 111111'; //step 1 - reduce it to digits: preg_match_all('(?![\+][0-9+])', $test1, $digits); var_dump($digits);
Output for 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Warning: preg_match_all(): Compilation failed: quantifier does not follow a repeatable item at offset 0 in /in/SYpRn on line 8 NULL
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 - 7.1.20, 7.2.0 - 7.2.33
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 0 in /in/SYpRn on line 8 NULL
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 0 in /in/SYpRn on line 8 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 0 in /in/SYpRn on line 8 array(0) { }

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