How to Create a Reliable Regex for Validating Persian Characters Only?

Regex for Accepting Only Persian Characters

In a scenario where custom form validators require only Persian characters, the following code initially appeared promising:

var myregex = new Regex(@"^[\u0600-\u06FF]+$");
if (myregex.IsMatch(mytextBox.Text))
{
    args.IsValid = true;
}
else
{
    args.IsValid = false;
}

However, it failed to detect specific Persian characters (گ, چ, پ, ژ). This article delves into the issue and provides a solution.

Wrong Assumptions

[u0600-u06FF] and [آ-ی] are incorrect character ranges for Persian validation.

• [u0600-u06FF] includes 209 unnecessary characters, including Arabic numbers.
• [آ-ی] encompasses 117 extra characters.

Accurate Character Ranges

To ensure accuracy, the following ranges should be used:

• Letters:

  • ^[آابپتثجچحخدذرزژسشصضطظعغفقکگلمنوهی] $
  • ^[u0622u0627u0628u067Eu062A-u062Cu0686u062D-u0632u0698u0633-u063Au0641u0642u06A9u06AFu0644-u0648u06CC] $

• Numbers:

  • ^[۰۱۲۳۴۵۶۷۸۹] $
  • ^[u06F0-u06F9] $

• Vowels:

  • [ ‬ٌ ‬ًّ ‬َ ‬ِ ‬ُ ‬ْ ‬]
  • [u202Cu064Bu064Cu064E-u0652]

Conclusion

By utilizing the correct character ranges, rejecting invalid Persian characters can be achieved. Additionally, Farsi supports diacritics used in Arabic, but their inclusion is optional during validation.

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