Javascript: use regex to find digits in the matching string

Question

I understand how to retrieve digits from a string after reading Regex using javascript to return just numbers

I am wondering if I can validate my input at the same time. While implementing an LMS, I am looking for input strings matching " com.interactions.*n*.objectives.*m*.id ", where n & m are integers.

In one regex function, can I retrieve the digits n & m ONLY IF my input string matches the pattern above? Or do I need to first validate the input string, and then pull the digits out afterwards?

Answer 1

You can use String#match with capturing groups :

var m = str.match(/^cmi\.interactions\.(\d+)\.objectives\.(\d+)\.id$/i);

and use m[1] and m[2] for the 2 values (integers) you want to capture.

Answer 2

Yes, you can indeed do both. I've made you this document so you can try it out: https://tonicdev.com/tonic/regex-validation

I recommend using the ^ and $ at the beginning and end of the regex, if not aaacom.interactions.55.objects.66.id would match for example (since the match can appear anywhere in the string otherwise).

Answer 3

Check this out for matching the valid string and getting the digits via capture groups:

com\.interactions\.(\d+)\.objectives\.(\d+)\.id

https://regex101.com/r/jW9sP6/1