regex specific character inside string

Question

I was trying to find solution, but couldn't. What will be regex when I have a string of defined length (let's say 10), and one of characters have to be specific letter (let's say 'd').

My first idea was something like this:

^([0-9d]{10})$

But it allows multiple 'd' in string, and I want exactly one.

Wiktor Stribiżew · Accepted Answer · 2018-06-20 13:14:10Z

4

You may use

^(?=.{10}$)[0-9]*d[0-9]*$

See the regex demo

Details

^ - start of string
(?=.{10}$) - any 10 chars (other than a newline) followed with the end of string (you may precise this part if you wish, (?=[0-9d]{10}$))
[0-9]* - 0+ digits
d - a d
[0-9]* - 0+ digits
$ - end of string.

edited Jun 20, 2018 at 13:14

answered Jun 20, 2018 at 13:10

Wiktor Stribiżew

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1 Comment

sniperd Over a year ago

wow, that's pretty clever. I was trying to use negative look aheads for not d

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