/g can be useful. But if you just want to know if something matches (which for me is most of the time), you don't need it.
The cases where m///g is useful are where:
- you need to save the position of the last match, or
- you're counting or saving the matches for later use (assigning the result of m/// to a variable)
In practice, I find myself using /g only in substitutions.
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