Return a regular expression to capture a function name.
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> [Regular expression][regexp] to capture a function name.
``bash`
npm install @stdlib/regexp-function-name
`javascript`
var reFunctionName = require( '@stdlib/regexp-function-name' );
#### reFunctionName()
Returns a [regular expression][regexp] to capture a function name.
`javascript
function beep() {
return 'boop';
}
var RE_FUNCTION_NAME = reFunctionName();
var str = RE_FUNCTION_NAME.exec( beep.toString() )[ 1 ];
// returns 'beep'
`
#### reFunctionName.REGEXP
[Regular expression][regexp] to capture a function name.
`javascript`
var str = reFunctionName.REGEXP.exec( Math.sqrt.toString() )[ 1 ];
// returns 'sqrt'
`javascript
var Int8Array = require( '@stdlib/array-int8' );
var reFunctionName = require( '@stdlib/regexp-function-name' );
var RE_FUNCTION_NAME = reFunctionName();
function fname( fcn ) {
return RE_FUNCTION_NAME.exec( fcn.toString() )[ 1 ];
}
var f = fname( Math.sqrt );
// returns 'sqrt'
f = fname( Int8Array );
// returns 'Int8Array'
f = fname( Object.prototype.toString );
// returns 'toString'
f = fname( function () {} );
// returns ''
`
*
- [@stdlib/utils-function-name][@stdlib/utils/function-name]: determine a function's name.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/regexp-function-name/tree/deno
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[umd-url]: https://github.com/stdlib-js/regexp-function-name/tree/umd
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[esm-readme]: https://github.com/stdlib-js/regexp-function-name/blob/esm/README.md
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[regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
[@stdlib/utils/function-name]: https://www.npmjs.com/package/@stdlib/utils-function-name