Perl Character Meanings
-
This page explains a little
about perl pattern matching
and some of the options.
Pattern Matching
- ~ - Used to identify a
string to be looked for in the
pattern.
- !~ - The oposite of the ~
operator used to determine if a
pattern does not match.
- / - Used to delimit the
pattern to be matched. An
example is: /Pattern/
Pattern matching options
- i - "Do case-insensitive
pattern matching"
- m - "Treat string as
multiple lines. That is, change
"^" and "$" from matching the
start or end of the string to
matching the start or end of any
line anywhere within the string.
"
- s - "Treat string as single
line. That is, change "." to
match any character whatsoever,
even a newline, which normally
it would not match. The /s and
/m modifiers both override the
$* setting. That is, no matter
what $* contains, /s without /m
will force "^" to match only at
the beginning of the string and
"$" to match only at the end (or
just before a newline at the
end) of the string. Together, as
/ms, they let the "." match any
character whatsoever, while yet
allowing "^" and "$" to match,
respectively, just after and
just before newlines within the
string."
- x - "Extend your pattern's
legibility by permitting
whitespace and comments. "
- \b - "Match a word boundary
"
- \B - "Match a non-(word
boundary) "
- \A - "Match only at
beginning of string "
- \Z - "Match only at end of
string, or before newline at the
end "
- \z - "Match only at end of
string "
- \G - "Match only at pos()
(e.g. at the end-of-match
position of prior m//g)"
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