Regex allow a string to only contain numbers 0 - 9 and limit length to 45

user_480426 0
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I am trying to create a regex to have a string only contain 0-9 as the characters and it must be at least 1 char in length and no more than 45. so example would be 00303039 would be a match, and 039330a29 would not.

So far this is what I have but I am not sure that it is correct

[0-9]{1,45}

I have also tried

^[0-9]{45}*$

but that does not seem to work either. I am not very familiar with regex so any help would be great. Thanks!

string-matching regex string
8 Answers

For this case word boundary (\b) can also be used instead of start anchor (^) and end anchor ($):

\b\d{1,45}\b

\b is a position between \w and \W (non-word char), or at the beginning or end of a string.

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