Iranian postal code validation

Question

Please, I need to validate Iranian postal code using regex. I write this regex for this case \b([^02\n\D]){4}[^5](\d){5} but its not working on rule number 5 and 7. please help me to fix it.

this is some rules about this regex:

1. It's all numeric

2. 10 digit count

3. don't use 0 in first 5 digit

4. don't use 2 in postal code

5. First 4 digit is not the same

6. The 5th digit cannot be 5

7. all digits aren't the same

Answer 1

The following regex satisifes your conditions:

\b(?!(\d)\1{3})[13-9]{4}[1346-9][013-9]{5}\b

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Explanation:

• \b - a word boundary
• (?!(\d)\1{3}) - negative lookahead to make sure that the 1st 4 digits are not the same.
• [13-9]{4} - matches 4 occurrences of all the digits except 0 and 2
• [1346-9] - matches a single digit that is not a 0,2 or 5
• [013-9]{5} - matches 5 occurrences of all the digits except 2
• \b - a word boundary