Regex not working as expected !

Question

Hi all, I wanted to create a regex for the pattern :-
* 5 digits underscore 11 digits

e.g. 12345_12345678901

My attempt :- /\d{5}[ _ ]\d{11}/

Failure case :- It is giving me true even if the length is increasing. E.g. 123456_12345678901,12345_1234567890123

Answer 1

Ashutosh Raturi
put \b at the start and at the end of your expression

Answer 2

Ashutosh Raturi, as FF9900 said:
/^\d{5}[_]\d{11}$/

^ for start
$ for end

You should also remove spaces from square brackets

Answer 3

FF9900 😎
online regex testers are super useful.

Answer 4

FF9900 can you please tell me how to do that?

Answer 5

Thanks to everyone for quick help 😃

Answer 6

Ashutosh Raturi

OrHy3 's
/^\d{5}_\d{11}$/
is more strict.

it will not match
#12345_12345678901
or
-12345_12345678901-

while
/\b\d{5}_\d{11}\b/
will match them

as FF9900 said, it depends on your use case.