Expanding a string by adding numeric characters using JavaScript Regular Expressions

Can you increment a numeric substring using regex/replace? For example, if the end of a string (like window location) contains #img-{digit}, is it possible to use regex to replace the digit with +1?

I know how to match the hash, but extracting the number, which could be more than 2 digits like 12, is my challenge.

var loc = window.location,
    locstr = loc.match(/#img-\d+/),
    // untested:
    locrep = locstr.replace(/\d/, Number($1) + 1);

If the current hash is #img-4, I need a JavaScript snippet that changes it to #img-5.

javascriptregexmath

Answer №2

If you are dealing with a string format such as #img-{number}, one way to work with it is by using the split method along with the dash symbol - as shown below:

var url = window.location.href,
    parts = url.split("-");
    var newUrl = parts[0] + parseInt(parts[1]) + 1;

Answer №3

Keep in mind that window.location will give you the window.location object. For example:

console.log(typeof window.location, typeof window.location.hash);

Give this a shot:

var loc = window.location.hash
, locrep = loc.match(/[^\d]/g).join("") + (1+Number(loc.match(/\d/g).join("")));

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