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<?php function regexp($string, $pattern) { return preg_match('/'.$pattern.'/', $string); } function getLeftDelimiter($string, $pattern) { $result = ''; while(1) { $current = $string; $position = strlen($string); while($position && regexp($current, $pattern)) { $position--; $current = substr($current, 0, -1); } $current = substr($string, 0, $position+1); if(regexp($current, '^('.$pattern.')$')) { $result .= $current; $string = substr($string, $position+1); } else { return $result; } } } function getRightDelimiter($string, $pattern) { $result = ''; while(1) { $current = $string; $position = 0; while($position<strlen($string) && regexp($current, $pattern)) { $position++; $current = substr($current, 1); } $current = substr($string, $position-1); if(regexp($current, '^('.$pattern.')$')) { $result = $current.$result; $string = substr($string, 0, $position-1); } else { return $result; } } } function getLeftChunk($string, $pattern) { $result = ''; $current = ''; $position= 0; while($position<strlen($string) && !regexp($current, $pattern)) { $position++; $current = substr($string, 0, $position); } $delimiter = getRightDelimiter($current, $pattern); return substr($current, 0, strlen($current)-strlen($delimiter)); } function regexpSplit($string, $pattern) { $result = []; $i = 0; while($string && ++$i<10) { $delimiter = getLeftDelimiter($string, $pattern); if($delimiter==$string) { break; } $string = substr($string, strlen($delimiter)); $chunk = getLeftChunk($string, $pattern); $string = substr($string, strlen($chunk)); $result[] = $chunk; } return $result; } $string = 'tbarbarfob12baz 56bar'; $pattern = 'bar|baz'; var_dump(regexpSplit($string, $pattern));