Did you test this? I'm not claiming you are wrong, but my quick test of it showed it not changing anything:

#!/usr/bin/perl -w
use strict;

my $TEXT= do { local $/; <DATA> };
if( $TEXT =~ /abc/g ) {
    $TEXT =~ s/\G(\D+)([\d\.\-]*)­/$1GOVALUE/g;
}
print $TEXT;
__END__
                    abc(" 0.123511,  0.074997,  0.103143,  0.153955,  
+0.260586",\
                            " 0.068394,  0.082183,  0.110329,  0.16114
+2,  0.267773",\
                            " 0.081887,  0.095677,  0.123822,  0.17463
+5,  0.281266",\
                            " 0.111534,  0.125324,  0.153470,  0.20428
+2,  0.310914",\
                            " 0.165731,  0.179521,  0.207666,  0.25847
+9,  0.365110");
[download]

The output was the same as the input.

Yes, I did test it.

my $TEXT= do { local $/; <DATA> };
$TEXT =~ /abc/g;
$TEXT =~ s/\G(\D+)([\d\.\-]*)/$1GOVALUE/g;
print $TEXT;
__END__
Some 01.35 numbers 019999 not to 01.055555 replace           
         abc(" 0.123511,  0.074997,  0.103143,  0.153955,  0.260586",\
                            " 0.068394,  0.082183,  0.110329,  0.16114
+2,  0.267773",\
                            " 0.081887,  0.095677,  0.123822,  0.17463
+5,  0.281266",\
                            " 0.111534,  0.125324,  0.153470,  0.20428
+2,  0.310914",\
                            " 0.165731,  0.179521,  0.207666,  0.25847
+9,  0.365110");
[download]

outputs:

Some 01.35 numbers 019999 not to 01.055555 replace
         abc(" GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE",\
                            " GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE,  
+GOVALUE",\
                            " GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE,  
+GOVALUE",\
                            " GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE,  
+GOVALUE",\
                            " GOVALUE,  GOVALUE,  GOVALUE,  GOVALUE,  
+GOVALUE");
GOVALUE
[download]

The final GOVALUE is because it matches an empty string.

Update: When I copy your code, I get a stealth trailing hyphen in the pattern space, and it fails to substitute.

---

Caution: Contents may have been coded under pressure.

Thanks. Sorry, I made a cut'n'paste mistake, including the soft hyphen that PerlMonks inserted for me when it displayed your code.

I remember being disappointed by \G not working in some cases, you didn't show any test code, and I was busy, so I didn't investigate further after my quick test failed.

- tye