Javascript regex to match part of the string but not the whole string

Question

This is my regex: (-?\d+)-(-?\d+).

The purpose is to match strings that denote ranges, including negative ones. For example:

1-10
0-100
-1-10, but also:
-100--10

Then with my regex, I will capture the first number, the last, but also the whole string. In Angular:

let regExp : RegExp = RegExp('(-?\\d+)-(-?\\d+)', 'g');
let values: RegExpExecArray = regExp.exec('-100--10');

From the values result, I can use positions values[1] and values[2], as values[0] is reserved for the whole string.

Obviously, the above works for me, but do you have any idea how to make my regex more precise? I.e. I don't want the whole string to be matched.

What is AppConstants.ROLLING_DEP_DATE_REGEX? Why not use the regexp to match what you describe? (e.g. /(-?\d+)-(-?\d+)/g) — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented May 2, 2019 at 16:09

mukesh210 · Accepted Answer · 2019-05-02 18:56:02Z

1

In your pattern (-?\\d+) is repeating so you can use only this pattern to match in text.

let pattern = RegExp('(-?\\d+)', 'g')
let text = '-100--10'
text.match(pattern)   //output: ["-100", "-10"]

This way, you don't have to match entire string.

answered May 2, 2019 at 18:56

mukesh210

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2 Comments

mukesh210 Over a year ago

@user1485864 Did this helped you?

user1485864 Over a year ago

From your answer I understand that my question does not make sense. Indeed, I have to match the whole input string, as I need be certain that the two patterns (-?\d+) are separated by a -. Thanks!

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