String - Validation & Integrity

Essential integrity checks for common formats: email structure, URL validity, custom password complexity, and unexpired JWT structure.

1. 🔒 Security Checks

   isPasswordValid({int minLength, int minUppercase, int minNumbers, int minSpecialChars}) · bool

   Checks if the string meets customizable password complexity requirements (length, uppercase, numbers, special characters).

   Show Parameters

   minLength · int · default: "8"

   The minimum required length of the password.

   minUppercase · int · default: "1"

   The minimum required number of uppercase letters.

   minNumbers · int · default: "1"

   The minimum required number of numerical digits.

   minSpecialChars · int · default: "1"

   The minimum required number of special characters (!@#$%^&*, etc.).

   // Requires 8+ chars, 1+ uppercase, 1+ number, 1+ special char
   print('P@sswOrd1'.isPasswordValid()); // true
   

   isValidJWT() · bool

   Checks if the string is a valid, unexpired JSON Web Token (JWT). Verifies structure, decodes payload, and checks the exp (expiry time) field.

   final validToken = 'header.payload.signature';
   print(validToken.isValidJWT()); // true (if not expired)
   

   This does NOT verify the signature for authenticity.

2. 📧 General Format Checks

   isEmailValid() · bool

   Checks if the string conforms to a standard email address format ([e-mail]).

   print('[e-mail]'.isEmailValid()); // true
   print('test@example'.isEmailValid()); // false
   

   isValidURL() · bool

   Checks if the string is a valid URL format, covering common protocols (http, https) and TLDs.

   print('[https://www.google.com](https://www.google.com)'.isValidURL()); // true
   print('www.example'.isValidURL());  // false