So what are the monks at large opinion on this ever so trivial a subject? Which alternate regex delimiter do you favour? And what are the arguments behind your opinion (if any)?

My quote character of choice when subsituting is the curly brace pair e.g

s{ ( \w+ ) [ ] ( \w+ ) }($2 $1)xg;
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And for anything but the simplest of regexes (that can't be fielded off to the likes of index()) the /x modifier is a must. I also use parentheses as the replace part of a substitute.

My reasoning is that curly braces look like a block and parentheses look like execution (or at least that's how it mnemonically maps in my head).
HTH

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broquaint