Date Validation with leap year handling, & it takes care of date validation in the format like :mm/dd/yyyy or mmddyyyy or mm-dd-yyyy or m/d/yyyy or m-d-yyyy. 12/01/1986 02/29/2016 02/29/2015 13/31/1986...

Parses a URL to the different parts

Parse an SFTP or FTP url and brak it into named capture groups.

Format: x0.00 Valid: 13.37 4.20 1.00...

Matches any number between 0 and 10 (inclusive) with 0 or 1 decimal places. Note that .5 will NOT be matched but 0.5 will. Also 10.X will not be matched, but 10 will.

Matches numbers that are likely to by financial amount. Does not consider the type of currency.

strip parentheses enclosed text with no keywords - handles nested parentheses - if using brackets/braces normalize string to parentheses then use the regex

Extract from {"city":{"id":1217734,"name":"Boysun","findname":"BOYSUN","country":"UZ","coord":{"lon":67.198608,"lat":38.206108},"zoom":8,"langs":[{"link":"http:\/\/en.wikipedia.org\/wiki\/Boysun"},{"ru":"Бойсун"}]},"time":1394871628,"main":{"temp":274.74,"temp_min":274.74,"temp_max":274.74,"pressure...

Searches for dotted decimal IPv4 Adresses and saves the numbers in match groups.

This is why

How to match the first line of a xml document

number with or without thousands separator(.) and decimal part(,) ES: 100000; 1.646; 13323,33; 3.444.434,44

Allow only two or more labels. Fix deprecated FQDN regexp not passing on test "dicas-l.com.br"

A zipcode regex for validation of both US and Canada

https://www.google.com http://www.google.net/hello https://www.google. http://www.google./hello above url matching with given regex...

This RegEx was posted on a Ruby site as one for enforcing password pattern. I added {8,32} to limit the length of the password, even though I realize no one has passwords longer than that. Rules: at least 1 digit, 1 special character (as defined), 1 upper case and 1 lower case character, between 8 ...