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 ...

For selecting paths without filename

trim leading and trailing whitespace from a string

Hosts regex for 42 school (france)