The second match in the flipflop operator /startpat/ ... /endpat/ destroys the captured Number ($1) of the left side. Consider these shell snippets. 
# no regex in end pattern of flipflop
$ echo "Curve4 " | perl -lne 'if (/Curve(\d+)/ ... eof) {print $1}'
4

# code similar to your example
$ echo "Curve4 " | perl -lne 'if (/Curve(\d+)/ ... /^\s*/) {print $1}'

[download]
print+qq(\L@{[ref\&@]}@{['@'x7^'!#2/"!4']});

In reply to Re: # Translation by codeacrobat
in thread # Translation by GiJoe

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