Validation

This provides a set of validation functions for common string patterns including email addresses, phone numbers, Japanese Katakana characters, English letters, and numeric strings.

Each validation function returns both a boolean validity check and a sanitized version of the input string with invalid characters removed.

Function	Purpose	Pattern
isEmail	Email address validation	Basic email format with allowed characters
isPhone	Chinese mobile phone validation	11-digit format starting with 1[3-9]
isKana	Japanese Katakana/Latin validation	Katakana Unicode range + Latin letters
isLetter	English letters only	A-Z, a-z characters
isNumber	Numeric strings only	0-9 digits

Email