This regex is used to remove HTML tag on string

Match simple linux file absolute path as /usr/share/my-folder/helloworld.jpg

supports all major protocols

First pass at a way to find credit card data using regex.

Validates a File Path and makes sure the correct extension is at the end.

utf-8 hex. code armenian. Firs character regexp

This regex grabs all kinds of imgur links and groups them in meaningful names aswell. This way you have full flow-control in your python-scripts.

If you want to understand an SQL statement for Hibernate: this replaces the selected fields in an SQL statement generated by Hibernate by a shorthand, since you usually just care about the logic. E.g. it changes select foo0_.bla as bla1_3, foo0_.bar as bar1_3, foo0_.baz1_3 as baz1_3 from ... to sele...

Match nth occurence of the patterns in the inner parenthesis. Put nth that you want to match in the curly braces (here, {3}).

Validates Credit Card Numbers of different type. Supports Visa, MasterCard, American Express, Diners Club, Discover and JCB Taken from http://www.regular-expressions.info/creditcard.html If you want to support only a particular type, customise it based on following....

Validate IPv4 addresses using PCRE's recursion patterns. A shorter but less efficient alternative to https://regex101.com/r/wZ6oY5/1

use this to get value of any side of an equation. You can combine this with https://regex101.com/r/fH5kJ1/1

Detects valid Roman numerals (up to 3999), and splits into 4 capture groups: thousands, hundreds, tens, and units.