Strong Password
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/
Email (Standard)
/^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/
IPv4 Address
/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/
Date (YYYY-MM-DD)
/^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/
Strip HTML Tags
/<(\/?[a-z][a-z0-9]*)\b[^>]*>/gi
Match URL
/(https?:\/\/[^\s]+)/g
Positive Lookahead
/abc(?=def)/
Negative Lookahead
/abc(?!def)/
Phone (Universal)
/^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$/
URL Slug
/^[a-z0-9]+(?:-[a-z0-9]+)*$/
Decimal Numbers
/^-?\d*\.?\d+$/
Duplicate Words
/\b(\w+)\s+\1\b/gi