# ReplaceRegexp

Finds the specified regular expression pattern and replaces it with the new text

```mathematica
ReplaceRegexp("price 100 EUR", "EUR|GBP", "USD") → "price 100 USD"
ReplaceRegexp("1999", "[9]", "0") → "1000"
```

#### Inputs

`ReplaceRegexp(string, searchRegexp, replaceWith, [isCaseSensitive], [allMatches])`

* `string` - A text value to search in
* `searchRegexp` - Regular expression to search for
* `replaceWith` - Text to replace with
* `[isCaseSensitive]` - **\[optional**: `true` by default\*\*]\*\* - Set `false` if search should be case **insensitive**
* `[allMatches]` - **\[optional**: `true` by default\*\*]\*\* - Set `false` if only the first match should be replaced