Netsparker - Netsparker is a tool for scanning web sites for security vulnerabilities.
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
rubular - A ruby based regular expression editor
Checkmarx - The industry’s most comprehensive AppSec platform, Checkmarx One is fast, accurate, and accelerates your business.
RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.