Hi, On Tue, 15 Jan 2019 10:43:49 -0500 Joshua Branson <jbra...@dismail.de> wrote:
> I'm not certain if this is the right list to report this to, but I just > installed autoscan version 2.21, and it gave me this warning: > > #BEGIN_SRC sh > autoscan > #END_SRC > > Unescaped left brace in regex is deprecated here (and will be fatal in Perl > 5.30), passed through in regex; marked by <-- HERE in m/\${ <-- HERE [^\}]*}/ > at /home/joshua/.guix-profile/bin/autoscan line 361. > > > Should I report this upstream instead? I think so, yes. autoscan is part of autoconf 2.21, so the bug report should go to the autoconf package. The regexp in question is s/\${[^\}]*}//g; Perl is complaining because perl regexp use curly braces to specify a range of valid repeats. Maybe the easiest way to understand it is that the following equivalences hold in regexps: ? is equivalent to {0,1} + is equivalent to {1,} * is equivalent to {0,} The above (at the end of the regexp "\${[^\}]*}") probably means a literal curly brace--but they don't escape it - hence the warning. It's only a warning because no valid repeat range can start with a closing curly brace. So perl can still figure out what you meant. But it's obviously not recommended to use unescaped closing curly braces to match a literal closing curly brace regardless.
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