Regex to validate brazilian money using Javascript

Question

I need to validate some form fileds that contain brazilian money (its name is "Real") using Javascript. It has the following format: ``` 0,01 0,12 1,23 12,34 123,45 1.234,56 12.235,67 123.456,78 1.234.567,89 12.345.678,90 123.456.789,01 1.234.567.890,12 ``` My regex knowledge is weak, can somebody help me please?

Accepted Answer

Does this do what you want?

```
^\d{1,3}(?:\.\d{3})*,\d{2}$
```

That says "1 to 3 digits, optionally followed by any number of groups of three digits preceded by a period, followed by a comma and two more digits." If you want to allow the leading whitespace present in your example, add `\s*` to the front:

```
^\s*\d{1,3}(?:\.\d{3})*,\d{2}$
```

As @ElRonnoco pointed out, the above regular expression accepts leading zeroes (e.g. 010.100,00). To disallow those, you may use this longer version:

```
^\s*(?:[1-9]\d{0,2}(?:\.\d{3})*|0),\d{2}$
```

To allow numbers that have no decimal part, or only one decimal digit, change it like this:

```
^\s*(?:[1-9]\d{0,2}(?:\.\d{3})*|0)(?:,\d{1,2})?$
```

If you want to find such strings inside longer strings rather than requiring them to match the whole thing, you can remove the `^` and `$` anchors.

Regex to validate brazilian money using Javascript

Solution

Problem