Works for all IPv6 addresses in removing them using regex

except russian, greek and arabic alphabets.

Using exactly four 9s and no other digits, write an equation which evaluates to 100

Extract a url from as string

email validation based on the restrictions for entering email adresses into a mongo db email field.

A validator/parser for math expressions. Written on PCRE regex. To change settings, change the 0 to 1 or 1 to 0 after a setting, example: (?){1} to disable, change to (?){0}

gets a postgis tablename from a mapfile with the given layer name, may not work depending on your mapfile layout

get contents of src attribute

Looks for string formated like an IP address.

Checks if a Bitcoin Address is in valid Base 58 format