Increment a number in a string in with regex

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How about: 

'url1'.replace(/\d+$/, function(n){ return ++n }); // "url2"
'url54'.replace(/\d+$/, function(n){ return ++n }); // "url55"

There we search for a number at the end of the string, cast it to Number, increment it by 1, and place it back in the string. I think that’s the same algo you worded in your question even.

Reference:

  • String.prototype.replace – can take a regex

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