<?php $string = 'id'; $pattern = ' ~^ (?: (?:(?P<function>function)\s*\(\s* (?:(?P<table1>.+)(?:\.))?(?P<column1>[^ ]+) \s*\)) | (?:(?P<table2>.+)(?:\.))?(?P<column2>[^ ]+) ) (?:\s+as\s+(?P<alias>.+))? $~ix '; var_dump(preg_match($pattern, $string, $fieldParts)); var_dump(preg_last_error());
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