How to set maxlength in regex?

Question

I have created this working regex below, this aims to accept phone numbers only ex. 09338195838.

^(09)[0-9]{9}

However I don't know how to set a maxlength that will accept only 11 digits. I've been to other similar questions like q1 but none really helped, and tried the below code but still it accepts even if it exceeds to 11 digits.

((09)[0-9]{9}){11}

Here is the detailed structure:

1. must starts with 09
2. must all numeric
3. must 11 digits

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Someone knows how to do this?

Answer 1

^09[0-9]{9}$
The $ symbol means "The string has to end, without other characters after this".

Answer 2

You can set word boundry.

((09)[0-9]{9})\b

test: https://regexr.com/51c40

if you want to make it more elastic, not only 11 digit

you can use ((09)\d{0,9})\b

{0,9} sets the min and max lengths, now it accepts maximum 11 digits starts with 09 and min 2 digits that is 09.