How to Accurately Validate Persian Characters Using Regular Expressions?

Validating Persian Characters Using Regular Expressions

In the context of form validation, ensuring that only Persian characters are accepted can be a challenge. To address this, a common approach involves using regular expressions (regex).

However, the regex ^[u0600-u06FF] $ often falls short, as it encompasses Arabic characters as well. To accurately validate Persian characters, a modified regex is necessary.

Updated Regex

To accurately accept Persian characters, consider the updated regex:

^[\u0622\u0627\u0628\u067E\u062A-\u062C\u0686\u062D-\u063A\u0641\u0642\u06A9\u06AF\u0644-\u0648\u06CC]+$

This expression matches the following character ranges:

• Letters: [آابپتثجچحخدذرزژسشصضطظعغفقکگلمنوهی]
• Numbers: [۰۱۲۳۴۵۶۷۸۹]
• Vowels: [ ‬ٌ ‬ًّ ‬َ ‬ِ ‬ُ ‬ْ ‬]

Alternatively, the regex can be simplified based on your regex flavor and include all letters at once, for example:

^[آ-ی]+$

Why the Extended Regex is Incorrect

The previously used regex ^[u0600-u06FF] $ is inadequate because it includes:

• 209 additional characters beyond the 42 character set required for Persian characters
• Arabic numbers instead of their distinct Persian counterparts

Additional Considerations

For comprehensive validation, consider including additional characters such as Hamza (ء) in the character set. Moreover, accommodate for different numeral systems by using separate regexes for numbers if necessary.

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