I need to access the value in a string between 2 words.
In my string I have 2 words : entityID=and =menu. Between those 2 words I have an number which can be in single character like 1-9 or two or more characters.
I want to tell to javascript, find me the characters between 'entityId=' and '=menu'.

[EDIT]

I tried with this function but no success :

function getId(str, start, end) {
    const result = str.match(new RegExp(start   "(.*)"   end));

    return result[1];
}

getId(myString, 'entityId= ', '&menu')

but I got an errror

Any idea ?

CodePudding user response：

What the question was about

If you are sure that the entityId= and the &menu= key are provided, you can use the method split to retrieve your string as the following example

const string = "http://myAmazingUrl?entityId=100101010&menu=1"

const word = string.split("entityId=")[1].split("&menu")[0]

console.log(word)

A little more

Here, it seems that you are trying to retrieve the key of a request.

I would suggest you to use the Url object and retrieve your parameters using searchParams

const url = new URL("http://myAmazingUrl?entityId=100101010&menu=1");
const entityId = url.searchParams.get("entityId");
console.log(entityId);

CodePudding user response：

This function should help.

function getStringInBetween(str, start, end) {
    const res = str.match(new RegExp(start   "(.*)"   end));
    return res[1];
}

const string = 'Hello my Stack Overflow friends';

console.log(getStringInBetween(string, 'Hello ', ' Stack'));

-- Output --