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How can I insert a backslash (\) character using replace()? [closed]

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I want to use the replace function in a forEach loop but it's not working:
var x = [".em", ".one"];
x.forEach((val, index) => {
console.log(val.replace(".", "\."));
});

The issue is because the \ character is the escape character in JS. If you want to output an actual \ in the string, you need to use two of them:
var x = [".em", ".one"];
x.forEach((val, index) => {
console.log(val.replace(".", "\\."));
});

How to retrieve substring which is outside of brackets in JS? [closed]

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I want the text which is outside of brackets, for eg.
Text is - Outside (inside)
and what I expect is - Outside
Can someone please help me to achieve this.

You can use slice & use indexOf to get the first (. This will extract all the characters before first (
let str = 'Outside (inside)'
let substr = str.slice(0, str.indexOf('('));
console.log(substr.trim())

If you wanted to remove all bracketed text from the string you could use
let str = 'Outside (inside)test(d 342 dd3d)dd(t423t t)dd()fasf(fsdfds32dfs)';
console.log(str.replace(/(\([\w\d ]*\))+/g, ''))

Javascript regex: issue when trying to parse both http and https instances of a natively archived string URL [closed]

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for example, consider,
what regex code is one supposed to use to get the last URL in the string , that is "iskme" in the above URL.
Example 1:
string 1-> "https://web.archive.org/web/204534534534645/http://www.iskme.org:80/"
result-> iskme . org
string 2 -> "https://web.archive.org/web/24534534642321/https://www.nytimes.com"
result: nytimes .com
what will be the common regex code for the above two examples:
I am currently using http:?//\w\w\w?\S+.\S\S\S
This regex is satisfying example 1 but fails in Example 2, where it fails to parse the 2nd string during the instance/occurrence of "NYTimes" main content URL.
I am new to Regex and tried to find the answer within google and understood that I needed to add the HTTP(s)? condition. But, it still seems to fail, can anyone point me in the right direction so I can solve this problem, Thank you in advance.

A simpler expression should do the trick:
var str = "https://web.archive.org/web/20030328195612/https://www.iskme.org:80/";
var url = str.match(/.*(https?:.*)/)[1];
The first .* will consume as many characters as possible up until the last occurrence of http(s): in the search string.

Answer above by #buttonupbub does the trick.
But if you need, for any reason, to store both urls for use after any string parse:
'https://web.archive.org/web/20030328195612/https://www.iskme.org:80/'
.split('http')
.reduce((acc, curr) => {
if (curr) {
acc.push( 'http' + curr )
}
return acc;
}, []);
// returns ["https://web.archive.org/web/20030328195612/", "https://www.iskme.org:80/"]
Making a lot of assumptions about the data here.

Regex in JavaScript replace function break script after uglifyjs or minify run [closed]

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Could someone with more regex experience than me help me out?
return path.replace(/\//g, '.').replace(/^\./, '');
I have found this regex in a js file within a giant app. The JS when run through npm node-minify or any of the others sees it as a comment and turns it into this:
return path.replace(/\g, '.').replace(/^\./, '');
I get the first bit is replacing all \ with a . and the second bit trims any leading . from the string. Can i change this so the regex pattern is wrapped in quotes?

Just use the RegExp constructor and quote your pattern.
const path = '/usr/bin/env';
const matchSlash = new RegExp('/', 'g');
const translate = path => path.replace(matchSlash, '.').replace(/^\./, '');
console.log(translate(path));

How to extract a string from parent string? [closed]

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I have a string url as follows:
var url = '/test/mybin/processes/edit.jsp?id={processId}';
I want to extract the string "processId" from above url. I can get it using indexOf and substring methods, but is there a better alternative to do it? Can we do it using Regex?

var procid = url.split("id=")[1];

You can easily use a regex:
url.match(/\{([^}]*)\}/)[1];
But for this simple pattern, using indexOf and substring, while not as terse, will have much better performance. TIMTOWTDI

'/test/mybin/processes/edit.jsp?id={processId}'.split('{')[1].split('}')[0]

JavaScript strings has regex support embeded:
var processId = url.match(/\?id=(.+)/)[1];
Only thing U need - be familiar with regular expressions
And if braces are problem:
var processId = url.match(/\?id=\{(.+)\}/)[1];