Regular Expressions / Regex

Really good online test site: http://regex101.com/

In depth explanation: https://www.regular-expressions.info/quickstart.html

Extract data from string with regex online tool: http://txt2re.com

http://www.phpliveregex.com/

http://www.regexlib.com

https://www.debuggex.com/

Expressions

Match one string or another

• (OK|VERIFYING)