PHP regular expression - filter number only
php, regex
Solution
Using is_numeric or intval is likely the best way to validate a number here, but to answer your question you could try using preg_replace instead. This example removes all non-numeric characters:
$output = preg_replace('/[^0-9]/', '', $string);
Problem
I know this might sound as really dummy question, but I'm trying to ensure that the provided string is of a number / decimal format to use it later on with PHP's number_format() function. How would I do it - say someone is typing 15:00 into the text field - what regular expression and php function should I use to remove the colon from it and make it only return the valid characters. preg_match() returns array - so I can't pass the result to number_format() unless I implode() it or something like this. Your help would be very much appreciated.