if string.match() doesn't match, why is execution of google apps script cancelled?

Question

if I use the following function within Google Sheets it doesn\'t return the value \"not found\". The logs tell me: \"Execution cancelled\".

This happens at the line:

Answer 1

Cause:

The return value of string.match ,

An Array whose contents depend on the presence or absence of the global (g) flag, or null if no matches are found.

and

null !== undefined

So, when it's null, the else statement executes and returns null to sheet. The "execution cancelled" is irrelevant and probably from old logsissue

Solution:

Use null to compare return value.

Snippet:

if (found === null) {