I need help creating a regular expression for JavaScript validation. The pattern I'm looking to match is numbers followed by an underscore, and then more numbers.
For example: 123456789_123456789
The length of the string can vary - it can have any number of digits, an underscore, and then another set of digits.
I've tried using [0-9]_[0-9], but I'm wondering if there's a better way to achieve this. Any suggestions would be greatly appreciated.
Thank you, Sreekanth
You're close! The correct regular expression should be:
^[0-9]{1,}_[0-9]{1,}$
or
^[0-9]+_[0-9]+$
This regex pattern indicates: "at least one digit ([0-9]{1,}), followed by an underscore (_) and then at least one more digit ([0-9]{1,}).
It will match:
12312_123123
1_1
but won't match:
123123_
_123123
_
123123_1231ddd
123dd_123
dd123_123
In case the numbers are not required: /^\d*_\d*$/, otherwise: /^\d+_\d+$/.
Here are some examples:
/^\d+_\d+$/.test("123_"); // returns false
/^\d+_\d+$/.test("123_123"); // returns true
Here is the attempt you made: [0-9]_[0-9]
Which means,
The correct answer should be: [0-9]+_[0-9]+
So basically,
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