Regex allow only numeric, one '$' in first position and one decimal - javascript

Question

Currently i have a RegEx which allows only numeric

if (/$^\d+([.]?\d{0,50})?$/.test(value)

Basically i need a RegEx which should allow

only numeric
one decimal point
one $ character

I have added $ in the existing expressing, but that does not seem to be the solution. How to achieve the above all 3 scenarios

@WiktorStribiżew doesn't seem to work. do u have the working example? — Matarishvan, Aug 22 '18 at 09:35
[It works for me](https://regex101.com/r/RsyTfE/1). No issues. It matches numeric values, only 1 point, and a `$` char (at the end). What do you need? — Wiktor Stribiżew, Aug 22 '18 at 09:36
@WiktorStribiżew thanks for your time. I wanted `$` should be in the first place. I have updated the `regex` as well — Matarishvan, Aug 23 '18 at 06:09
@Matarishvan Do you mean that "$" is allowed? Or do you mean a single "$" is allowed before a valid numeric value? — caedmon, Aug 23 '18 at 06:21
@caedmon single `$` should be allowed which should be in the first position, Then numeric with one decimal — Matarishvan, Aug 23 '18 at 06:22
@Matarishvan Try [`/^\$?\d+(?:\.\d{1,50})?$/`](https://regex101.com/r/ELD8Qi/1) — Wiktor Stribiżew, Aug 23 '18 at 07:03

score 0 · Answer 1 · answered Aug 23 '18 at 06:32

0

If I'm understanding the question correctly, this should work:

/^(\$|\$\d+(\.\d{0,50})?)$/

This regex will accept a value of "$" as well as a numeric value with $ prefix.

answered Aug 23 '18 at 06:32

caedmon

score 0 · Answer 2 · answered Aug 23 '18 at 11:41

You seem to be looking for

/^\$?\d+(?:\.\d{1,50})?$/

Details

^ - start of a string
\$? - an optional $ char (must be escaped)
\d+ - one or more digits
(?:\.\d{1,50})? - an optional non-capturing group matching 1 or 0 occurrences of:
- \. - a dot
- \d{1,50} - one to fifty digits
$ - end of string.

2 Answers2