Regex Tester & Validator

Common Patterns Library

• Email

  ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

  Validates email addresses

• URL

  https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)

  Matches HTTP/HTTPS URLs

• Phone (US)

  ^(\+1)?[-. ]?\(?\d{3}\)?[-. ]?\d{3}[-. ]?\d{4}$

  Matches US phone numbers

• IPv4 Address

  ^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$

  Matches IPv4 addresses

• Date (YYYY-MM-DD)

  ^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$

  Matches dates in YYYY-MM-DD format

• Hexadecimal Color

  ^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$

  Matches hex color codes

• Credit Card

  ^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|6(?:011|5[0-9]{2})[0-9]{12}|(?:2131|1800|35\d{3})\d{11})$

  Matches major credit card formats

• Username

  ^[a-zA-Z0-9_-]{3,16}$

  Alphanumeric username, 3-16 characters

• Password (Strong)

  ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

  Minimum 8 chars, 1 uppercase, 1 lowercase, 1 number, 1 special char

• HTML Tags

  <([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)

  Matches HTML tags