MRE_regx does not trim whitespace as expected:
$ perl -de 1
Loading DB routines from perl5db.pl version 1.3
Editor support available.
Enter h or `h h' for help, or `man perldebug' for more help.
main::(-e:1): 1
DB<1> $str = ' x '; $str =~ s/^\s+((?:.+\S)?)\s+$/$1/s;
DB<2> x $str
0 ' x'
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