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I'm using HTML5 form validation to validate phone numbers from India.

Phone numbers from India are 10 digits long, and start with 7, 8, or 9.

For example:

7878787878
9898989898
8678678878
These phone numbers are valid, but

1212121212
3434545464
6545432322
are invalid.

Suggest a pattern that can detect valid India phone numbers.

So far, my pattern is [0-9]{10}, but it doesn't check if the first digit is 7, 8, or 9.



Answer:-
How about this? /(7|8|9)\d{9}/

It starts by either looking for 7 or 8 or 9, and then followed by 9 digits.