JavaScript Regular expressions Matching With .exec()
Example
Match Using .exec()
RegExp.prototype.exec(string) returns an array of captures, or null if there was no match.
var re = /([0-9]+)[a-z]+/;
var match = re.exec("foo123bar");
match.index is 3, the (zero-based) location of the match.
match[0] is the full match string.
match[1] is the text corresponding to the first captured group. match[n] would be the value of the nth captured group.
Loop Through Matches Using .exec()
var re = /a/g;
var result;
while ((result = re.exec('barbatbaz')) !== null) {
console.log("found '" + result[0] + "', next exec starts at index '" + re.lastIndex + "'");
}
Expected output
found 'a', next exec starts at index '2'
found 'a', next exec starts at index '5'
found 'a', next exec starts at index '8'
