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Concepts
Match nothing but zeroes after the first zero
Check if password is "8 characters including 1 uppercase letter, 1 special character, alphanumeric characters"
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Regular Expression Visualizer
Regexper
Debuggex
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Additional Reference(s)
Beginners Guide to Regular Expressions using JavaScript
The Regular Expression (RegEx) Cheat Sheet you always wanted
Regular Expressions for Regular Folk
QuickRef.ME -
RegEX Cheatsheet
Away and beyond with Regular Expressions
OverAPI.com Regex Cheat Sheet