Get filename from string path in javascript?

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How to get the filename from string-path in javascript?

Here is my code

var nameString = "/app/base/controllers/filename.js"; //this is the input path string

do something here to get only the filename 

var name = ???   //this value should equal to filename.js
javascript regex string
4 Answers

Here one more detailed solution using Regular Expressions.

Alternative 1 (generic): Get a file name (whatever) from a string path.

const FILE_NAME_REGEX = /(.+)\/(.+)$/

console.log("/home/username/my-package/my-file1.ts".replace(FILE_NAME_REGEX, '$2'))

console.log("/home/username/my-package/my-file2.js".replace(FILE_NAME_REGEX, '$2'))

Alternative 2 (advanced): Get only a .ts file name from a string path.

const JS_PATH = "/home/username/my-package/my-file.spec.js"
const TS_PATH = "/home/username/my-package/my-file.spec.ts"

// RegExp accepts only `.ts` file names in lower case with optional dashes and dots
const TS_REGEX = /(.+)\/([a-z.-]+\.(ts))$/

// a. Get only the file name of a `.ts` path
console.log(TS_PATH.replace(TS_REGEX, '$2'))

// b. Otherwise it will return the complete path
console.log(JS_PATH.replace(TS_REGEX, '$2'))

Note: Additionally you can test first the regular expressions above in order to validate them before to getting the expected value.

TS_REGEX.test(TS_PATH)
// > true

TS_REGEX.test(JS_PATH)
// > false

More information at MDN - Regular Expressions

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