For future browsers: /d should be \d, and really, unless you intend to allow unicode digits, should probably be [0-9].

Thats what //a and //aa are for (since v5.13.10 according to perlver)

$ perl -Mre=debug -le "print qr/\d/"
Compiling REx "\d"
Final program:
   1: DIGIT (2)
   2: END (0)
stclass DIGIT minlen 1
(?^:\d)
Freeing REx: "\d"

$ perl -Mre=debug -le "print qr/\d/u"
Compiling REx "\d"
Final program:
   1: DIGIT (2)
   2: END (0)
stclass DIGIT minlen 1
(?^u:\d)
Freeing REx: "\d"

$ perl -Mre=debug -le "print qr/\d/a"
Compiling REx "\d"
Final program:
   1: DIGITA (2)
   2: END (0)
stclass DIGITA minlen 1
(?^a:\d)
Freeing REx: "\d"

$ perl -Mre=debug -le "print qr/\d/aa"
Compiling REx "\d"
Final program:
   1: DIGITA (2)
   2: END (0)
stclass DIGITA minlen 1
(?^aa:\d)
Freeing REx: "\d"

[download]

In reply to Re^3: substituting capture groups substrings ( s///aa m//aa qr//aa) by Anonymous Monk
in thread substituting capture groups substrings by naturalsciences

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