# isRegExpString
> Test if a value is a regular expression string.
## Usage
```javascript
var isRegExpString = require( '@stdlib/assert/is-regexp-string' );
```
#### isRegExpString( value )
Tests if a `value` is a regular expression `string`.
```javascript
var bool = isRegExpString( '/^beep$/' );
// returns true
```
## Examples
```javascript
var isRegExpString = require( '@stdlib/assert/is-regexp-string' );
var bool;
bool = isRegExpString( '/beep/' );
// returns true
bool = isRegExpString( '/beep/gim' );
// returns true
bool = isRegExpString( 'beep' );
// returns false
bool = isRegExpString( '' );
// returns false
bool = isRegExpString( null );
// returns false
```
* * *
## CLI
### Usage
```text
Usage: is-regexp-string [options] []
Options:
-h, --help Print this message.
-V, --version Print the package version.
```
### Examples
```bash
$ is-regexp-string '/beep/'
true
```
To use as a [standard stream][standard-streams],
```bash
$ echo -n '/beep/' | is-regexp-string
true
```
[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams