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+----------------------------- In the scalar $s (interpreted as a str +ing), | +--------------------- if you find an _ (underscore) | | +----------------- that's followed by 0 or more of anythi +ng but an _ (underscore) | | | and then the end-of-string, | | | + -- replace it with a , (comma). | | | | V V V V $s =~ s{ _ (?= [^_]* \z) }{,}xms;

Update: See "Look-Around Assertions" in the Extended Patterns of perlre.

(And the use of  <code> ... </code> tags would still be much appreciated.)

Another Update: If you have Perl version 5.10+, another way (see  \K in Extended Patterns):

c:\@Work\Perl\monks>perl -wMstrict -le "use 5.010; ;; my @flist = qw( 1st-device-CA_Eth.0/1 2nd-device_TX_Gig.1/1 3rd_device_MO_Gig.1/1 ); ;; for my $s (@flist) { print qq{'$s'}; $s =~ s{ .* \K _ }{,}xms; print qq{'$s'}; print ''; } " '1st-device-CA_Eth.0/1' '1st-device-CA,Eth.0/1' '2nd-device_TX_Gig.1/1' '2nd-device_TX,Gig.1/1' '3rd_device_MO_Gig.1/1' '3rd_device_MO,Gig.1/1'

In reply to Re^3: regex to rename last _ with , by AnomalousMonk
in thread regex to rename last _ with , by Anonymous Monk

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