> For the complete documentation index, see [llms.txt](https://docs.tabula.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tabula.io/data-transformation/formulas/string-functions/startswithregexp.md).

# StartsWithRegexp

Checks if a string starts with a search regular expression

```mathematica
StartsWithRegexp("123456", "[1-3]") → true
StartsWithRegexp("Australia", "[a-c]") → false
```

#### Inputs

`StartWithRegexp(string, searchRegexp, [isCaseSensitive])`

* `string` - A text value to search in
* `searchRegexp` - Regular expression to search for
* `[isCaseSensitive]` - **\[optional**: `true` by default\*\*]\*\* - Set `false` if search should be case **insensitive**
