For example, when it is needed to match the string "Tarzan" (without the quotes), in "Tarzan and Jane", and "Jane and Tarzan", but not in "Tarzan" (with the quotes). The wanted string is in Group 1.

Encontra qualquer preço presente num documento.

match ip address

Regular expression with named groups for email addresses

matches js files like app.js or jquery.min.js

check name thai

กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพภมยรลฤลวศษสหฬอฮ ref: http://www.utf8-chartable.de/unicode-utf8-table.pl?start=3584&number=128&utf8=0x

This regexp matches for example that: 10+10 10,0+9,9 10,0+9 10+9,9 allowed operations are: +,-,/,*...

designed to work specifically with the parser of the python dateutil package

http://www.pelagodesign.com/blog/2009/05/20/iso-8601-date-validation-that-doesnt-suck/