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?

Use: var m = str.match(/^com\.interactions\.(\d+)\.objectives\.(\d+)\.id$/); and use m[1] and m[2] for your 2 values. — anubhava
– anubhava, Commented Aug 28, 2015 at 20:55
To my SCORM audience cringing - the pattern really starts with 'cmi', not 'com', but changing it now would compromise the answers. My head was in Androidland — Chicowitz
– Chicowitz, Commented Aug 28, 2015 at 21:51

anubhava · Accepted Answer · 2015-08-28 21:51:53Z

2

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.

edited Aug 28, 2015 at 21:51

answered Aug 28, 2015 at 21:14

anubhava

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Francisco Ryan Tolmasky I · Accepted Answer · 2015-08-28 20:57:00Z

1

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).

answered Aug 28, 2015 at 20:57

Francisco Ryan Tolmasky I

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lintmouse · Accepted Answer · 2015-08-28 20:56:29Z

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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

answered Aug 28, 2015 at 20:56

lintmouse

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