How implement regex for a textfield to allow one comma one space at a time in Extjs

Question

I am working on a textfield to make it allow only numbers with max one comma and one space(max) at any occurrence. It can accept value like "5,8", "5 ,8" and "5 , 8". It should not allow two or more spaces or commas at a time.

I have tried below code but its not working.

this.regex = new RegExp('^\\d+(?\s\\d+)?(?:,\\d*(?\s\\d+)?)*$');

hello @The, I have tried your regex and just replaced dot by \s but I think it needs some more changes.. — Sunil Bamal, Aug 06 '19 at 11:20
`this.regex = /^\d+(?: ?(?:, ?)?\d+)*$/;` or `this.regex = /^\d+(?:\s?(?:,\s?)?\d+)*$/;` ([demo](https://regex101.com/r/8w0IWM/1)) — Wiktor Stribiżew, Aug 06 '19 at 11:21
Then `/^\d+(?:(?: ,|, ?)?\d+)*$/` or `/^\d+(?:(?:\s,|,\s?)?\d+)*$/`? See [this demo](https://regex101.com/r/pd0Vlg/1). — Wiktor Stribiżew, Aug 06 '19 at 11:44
thanks WiktorStribiżew, The fourth bird, @The can we modify new RegExp('^(?:\\d+(?:\\d+)?|\\d+)(?: ?, ?(?:\\d+(?:\\d+)?|\\d+))*$'); to make it in way so that it can accept space at last as well? — Sunil Bamal, Aug 06 '19 at 12:30

score 0 · Answer 1 · answered Aug 06 '19 at 12:50

This is quite a simple solution.

In order to accept possible characters you can use ?, which signifies exactly 0 or exactly 1 occurrence of the preceding character. For your requirement, the regex pattern:

^\d+\s?,\s?\d+$

Will allow 2 numbers (with multiple digits, if you need it) with a comma between them, with optional spaces.

See the example on regex101

To implement in the line of code you shared:

this.regex = new RegExp('^\\d+\\s?,\\s?\\d+$');

How implement regex for a textfield to allow one comma one space at a time in Extjs

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