# regex.is\_match()

`regex.is_match(haystack, pattern)` returns `true` if the regex pattern matches anywhere in the haystack string, otherwise `false`.

## Returns

* if `haystack` is a string and `pattern` matches anywhere in it, returns `true`.
* if `haystack` is a string and `pattern` does not match, returns `false`.
* if `haystack` is not a string, returns `null`.

## Examples

```javascript
regex.is_match(message, /error|exception/i)
```