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<?php $tests = [ 'bar 3 m foo', // - 'bass drop 2 d bare', // - '2 3 m foo foo', // - '1 222 4 d baz', // - '5d 4h 3m 2s', // - '2 d 3 m baz', // + '5d 4h 3m 2s foo', // + '2 s foo', // + '222 h baz bar', // + '1 mon foo', // + mon for month? '1w bar', // + '1 month baz', // + '2 months foobar', // + '4 months 2 months foo' // + repeating same string is allowed by strtotime, though it sums up ]; /* * Replaces (s|m|h|d|w|mon) with strtotime compatible abbreviations * * ps. (?&int) is there so it doesn't replace the 's' in 'months' etc. * * @param array $tests * @return array */ function normalizeTimeSpec($tests) { $reg1 = "/(?<int> (?:\G|(?!\n)) \s*\b \d{1,5} \s* )\K (?<time> (?: s|m(on)?|h|d|w)\b ) /uix"; $array = []; foreach($tests as $case){ $out = preg_replace_callback ($reg1, function($matches){ switch($matches['time']){ case 's': $t = 'sec'; break; case 'm': $t = 'min'; break; case 'h': $t = 'hour'; break; case 'd': $t = 'day'; break; case 'w': $t = 'week'; break; case 'mon': $t = 'month'; break; } return $t; }, $case); $array[] = $out; } return $array; } /* * Test whether given time string passes regex rules & match * @param array $tests * @return array */ function testTimeSpec($tests){ $finalArray = []; $regex = <<<'REGEX' /(?(DEFINE) (?<int> (\s*\b)? (\d{1,5})? (\s*)? ) (?<timepart> (?&int) ( s(ec(ond)?s?)? | m(in(ute)?s?|onths?)? | h(rs?|ours?)? | d(ays?)? | w(eeks?)? ) \b ) ) ^(?<time> (?:(?&timepart)(*SKIP).)+ ) (?<string>.+)$ /uix REGEX; foreach($tests as $case){ if(preg_match($regex, $case, $matches)){ $finalArray[] = $matches['time'].$matches['string']; } } return $finalArray; } //$output = normalizeTimeSpec($tests); $output = testTimeSpec(normalizeTimeSpec($tests)); print_r($output);