If you interpolate without /o, perl will always do the work of stringifying everything you gave it and concatenating it all into a single string. If the current string matches the last string then the compiled regexp from last time is re-used. This is an implementation detail and would need justification to get documented.

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In reply to Re: Questions concerning /o regex modifier by diotalevi
in thread Questions concerning /o regex modifier by Limbic~Region

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