| Wildcard pattern. Wildcards are similar to sh-style file globbing.
A wildcard pattern is implicitly anchored, meaning that it must match the entire string.
The wildcard operators are:
? matches one arbitrary character
matches zero or more arbitrary characters
[xyz] matches characters x or y or z
{foo,bar,baz} matches expressions foo or bar or baz
() grouping to extract fields
\ escape one of these special characters
Escape codes (like \n and \t) and Perl5 character classes (like \w and \s) may also be used.
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