How to replace a url using regex in javascript-CodePudding

I have a url in the format url = /api/v1/customers/123/spend/456

I needed to replace the numbers between slashes as *.Same for numbers in the end of url as * .

so my expected url output url = /api/v1/customers/*/spend/*

How can we achieve this using RegEx??

CodePudding user response：

You could use a regex replacement:

var url = "url = /api/v1/customers/123/spend/456";
var output = url.replace(/\/\d (\/|$)/g, "/*$1");
console.log(output);

The regex pattern used here matches:

/      / separator
\d     a number
(/|$)  either / or the end of the URL (capture)

Note that we replace with /*$1, where $1 may or may not be a captured separator (not in the case of the final number).

CodePudding user response：

You can do this by using lookaround(lookahead & lookbehind), using these you can match only the numbers.

let pattern = /(?<=\/)\d (?=\/|$)/g
let url = "/api/v1/customers/123/spend/456"

url = url.replace(pattern, '*')
console.log(url)

(?<=\/)\d (?=\/|$)

(?<=\/)  lookbehind which matches the / before a number
\d       matches one of more digits
(?=\/|$) loohahead which matches either the / after the number or the end of the string