The biggest change in the syntax is the addition of delimiters. ereg(‘^hello’, $str); preg_match(‘/^hello/’, $str); Delimiters can be pretty much anything that is not alpha-numeric, a backslash or a whitespace character. The most used are generally ~, / and #. You can also use matching brackets: preg_match(‘[^hello]’, $str); preg_match(‘(^hello)’, $str); preg_match(‘{^hello}’, $str); // etc If … Read more
The problem is really old, but there are some new developments related to PHP 7.3 and newer versions that need to be covered. PHP PCRE engine migrates to PCRE2, and the PCRElibrary version used in PHP 7.3 is 10.32, and that is where Backward Incompatible Changes originate from: Internal library API has changed The ‘S’ … Read more
You need a delimiter for your pattern. It should be added at the start and end of the pattern like so: $pattern = “/My name is ‘(.*)’ and im fine/”; // With / as a delimeter
PHP regex strings need delimiters. Try: $numpattern=”/^([0-9]+)$/”; Also, note that you have a lower case o, not a zero. In addition, if you’re just validating, you don’t need the capturing group, and can simplify the regex to /^\d+$/. Example: http://ideone.com/Ec3zh See also: PHP – Delimiters
Why use regex? Use DateTime class. function validateDate($date, $format=”Y-m-d H:i:s”) { $d = DateTime::createFromFormat($format, $date); return $d && $d->format($format) == $date; } You can use this function for all kind of date/time validations. Examples: var_dump(validateDate(‘2012-02-28 12:12:12’)); # true var_dump(validateDate(‘2012-02-30 12:12:12’)); # false var_dump(validateDate(‘2012-02-28’, ‘Y-m-d’)); # true var_dump(validateDate(’28/02/2012′, ‘d/m/Y’)); # true var_dump(validateDate(’30/02/2012′, ‘d/m/Y’)); # false var_dump(validateDate(’14:50′, … Read more