CODEWITHSUNDEEP
javascriptreactjsregex
Thien
Thien

Reputation: 51

Regular expression for format xx-xx (does not contain letters)

I am trying to use regex to check if the user input is in the correct format xx-xx (input only accepts numbers, does not accept alphanumeric characters)

I tried: /[1-9]{1,}\-[1-9]{1,}/ but when entering alphabetic characters still pass this test.

Can you guys help me. Thank.

Upvotes: 3

Views: 137

Answers (3)

Mrwaks
Mrwaks

Reputation: 160

On the other hand, you can have several cases depending on what you are looking for precisely.

In case you agree that an xx-xx value can be 00-00 and any other value, you should use this regex instead:

/^\d{2}-\d{2}$/

In case you accept that an xx-xx value is never 00-00 but can be 01-03 and any other value, but never 00-00, you should use this regex (a bit long, sorry, but does the job perfectly):

/^[1-9](?=[0-9])[0-9]-[1-9](?=[0-9])[0-9]$|^[0-9](?=[1-9])[1-9]-[0-9](?=[1-9])[1-9]$/

Enjoy !

Upvotes: 0

Mrwaks
Mrwaks

Reputation: 160

Your regex is just fine, you just need to add positional asserts, "^" for the start of the string and "$" for the end of the string:

/^[1-9]{2}\-[1-9]{2}$/

It is better to put "{2}" if you only want xx-xx

Upvotes: 2

Duncan Lutz
Duncan Lutz

Reputation: 126

/\d{2}-\d{2}/

Worked for me.

Breakdown:

\d checks for a digit character, i.e. 0-9.

{2} checks for two digits next to each other specifically.

- just checks for the hyphen character.

Upvotes: 0

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