?-xism:

[fishfry]

The statement

print qr/abc/;

produces the output

(?-xism:abc)

I looked in man perlop and didn't find a clear description of what this
means. Where's this documented? What's it mean?

 

[David K. Wall]

The statement

print qr/abc/;

produces the output

(?-xism:abc)

I looked in man perlop and didn't find a clear description of what this
means. Where's this documented? What's it mean?

Try perlre instead.

"(?imsx-imsx)"
One or more embedded pattern-match modifiers, to be turned on
(or turned off, if preceded by "-") for the remainder of the
pattern or the remainder of the enclosing pattern group (if
any). This is particularly useful for dynamic patterns, such
...

 

[gnari]

The statement

print qr/abc/;

produces the output

(?-xism:abc)

I looked in man perlop and didn't find a clear description of what this
means. Where's this documented? What's it mean?

try perlre

gnari

 

[Andy Hassall]

The statement

print qr/abc/;

produces the output

(?-xism:abc)

I looked in man perlop and didn't find a clear description of what this
means. Where's this documented? What's it mean?

perldoc perlre



See also module YAPE::Regex::Explain
<http://theoryx5.uwinnipeg.ca/CPAN/data/YAPE-Regex-Explain/Explain.html>

... which says:

The regular expression:

(?-imsx:abc)

matches as follows:

NODE EXPLANATION