How to get possibly overlapping matches in a string

Question

I\'m looking for a way, either in Ruby or Javascript, that will give me all matches, possibly overlapping, within a string against a regexp.

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Let\'s say I have

Answer 1

Approach of RegExp /(a.c)|(a.*c)/g is to match "a" character followed by any character followed by "c" ; "a.*c" is to match "a" followed by any character followed by preceding character followed by "c" character ; note RegExp at (a.*c) could probably be improved. Condition at if checks if last character in input string is "c" , if true , push full input string to res results array

var str = "abcadc"
, res = str.match(/(a.c)|(a.*c)/g); 
if (str[str.length - 1] === "c") res.push(str);

document.body.textContent = res.join(" ")