Map in a void context! Bad Zaxo! :-)

I cannot fathom why you would take this approach when the following would be much clearer and avoid the building of a list return which is being discarded:

s/\n/<br\/>/g for $var1, $var2;
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Note too, that this isn't a "style" issue, but one of using the best function for a given task - Yes, map does fit the task here, however it is only the loop function of map which you are making use of, not the list return, a function better suited to a for or foreach loop.