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Regex::Explain output
The regular expression:
(?-imsx:^abcdefghijklmnopqrstuvwxyz0123456789_$()+-/)
matches as follows:
NODE EXPLANATION
----------------------------------------------------------------------
(?-imsx: group, but do not capture (case-sensitive)
(with ^ and $ matching normally) (with . not
matching \n) (matching whitespace and #
normally):
----------------------------------------------------------------------
^ the beginning of the string
----------------------------------------------------------------------
abcdefghijklmnopqrst 'abcdefghijklmnopqrstuvwxyz0123456789_'
uvwxyz0123456789_
----------------------------------------------------------------------
$ before an optional \n, and the end of the
string
----------------------------------------------------------------------
( group and capture to \1 (1 or more times
(matching the most amount possible)):
----------------------------------------------------------------------
)+ end of \1 (NOTE: because you are using a
quantifier on this capture, only the LAST
repetition of the captured pattern will be
stored in \1)
----------------------------------------------------------------------
-/ '-/'
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------
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