I tend to comment regexps like this:
$path=~/^\s*([\w-]+) # elt
\s*\[\s*\@ # [@
([\w-]+) # att $1
\s*=\s*(["']) # = " (or ',) $2
(.*?) # value $3
\3\]\s*$/gx) # "] (or ')
It works very well for moderately complex regexps.
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