Regular Expressions 101

Pattern that check your string to match Twitter user profile URL.

Pattern that check your string to match Google Plus user profile URL.

this regular expression allow numbers with one number from 1 to 5 and only one decimal value Onlys accept numeric values from 1.0 to 5

Usage: "40%".replace(/\b(\d\.]+)[mkb%/ig, '$1')

This regular expression validates if given string is formatted in Base64, additional it accepts new lines, since payload can have new lines in it.

Extract all Steam Keys from a Given String

Awesome explanation of nested lookbacks

Check if brazilian names are imputed correctly. Ex: Paulo da Silva

Valid and Invalid emails

Validate a Json Web Token (JWT).

validator voor kenteken vb: 11-AA-BB

parse the apache access log

fjk@1Qaa$

Matches version strings.