Matches any IPv4 address

Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found

Match regular expressions substitutions, I personally use this to perform my validate if it is a substitution, then call re.sub() on it.

An extremely complete regex, that... Accepts international phones and most of regional phone numbers; Accepts phone numbers with/without "+", with/without space or "-" in the middle of the phone, and more. Gets groups of all important data of the phone number (local code, country code and the phone number itself)

Full email validation with optional "." "-" "_"

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Awesome explanation of nested lookbacks

matches only those commas that are between sets, or between members of a set. does not match commas that are inside members.

/* -- This is a RegEx for validating one Italian ATECO code. -- For original specification visit: http://www.istat.it/it/archivio/17888 -- Valid: */ 1 01 01.2 01.02 01.02.3 01.02.03 // Not Valid: a asc 0123 012.3 013.456 123456 01/02/03

checklists item

allows for all legal IPv4 addresses

why doesn't this match text in brackets?