The g flag tells the match operator and the substitution operator to match repeatedly. It makes no sense to use on other operators that do not performing any matching (such as q, qq, qr, qx and tr).

Option Pertains to (?:) qr// m s tr
mmeaning of regular expression patternYesYesYesYes
smeaning of regular expression patternYesYesYesYes
imeaning of regular expression patternYesYesYesYes
xmeaning of regular expression patternYesYesYesYes
pmeaning of regular expression patternYesYesYesYes
a/d/l/umeaning of regular expression patternYesYesYesYes
nmeaning of regular expression patternYesYesYesYes
 
ocompiling of regular expression patternsYesYesYes
 
cmatching of regular expression patternsYesYes
gmatching of regular expression patternsYesYes
 
ereplacement expressionYes
eereplacement expressionYes
 
rinput modificationYesYes
 
ctransliterationYes
dtransliterationYes
stransliterationYes

The options that pertain to the meaning of regular expression pattern are documented in perlre. The others are documented as part of the documentation of the operators to which they pertain.

In reply to Re: 'g' flag w/'qr' by ikegami
in thread 'g' flag w/'qr' by perl-diddler

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