diff options
| author | Karl Williamson <khw@cpan.org> | 2021-01-13 07:32:25 -0700 |
|---|---|---|
| committer | Karl Williamson <khw@cpan.org> | 2021-01-20 06:16:15 -0700 |
| commit | 012ac233b0f87e11d3ffed84dbca75e927e854aa (patch) | |
| tree | c04bbfebac18e79c49e481ed9fbe752dd6ad2640 | |
| parent | 27a1b63db3d47055da3bf36b5ac9f25948d0ef02 (diff) | |
| download | perl-012ac233b0f87e11d3ffed84dbca75e927e854aa.tar.gz | |
perlrebackslash: A few tweaks
Some white-space changes for vertical alignment, a new example, and
a couple of clarifications.
| -rw-r--r-- | pod/perlrebackslash.pod | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/pod/perlrebackslash.pod b/pod/perlrebackslash.pod index 94fb99d96e..9500bef527 100644 --- a/pod/perlrebackslash.pod +++ b/pod/perlrebackslash.pod @@ -218,7 +218,7 @@ meaning by the regex engine, and will match "as is". =head3 Octal escapes There are two forms of octal escapes. Each is used to specify a character by -its code point specified in octal notation. +its code point specified in base 8. One form, available starting in Perl 5.14 looks like C<\o{...}>, where the dots represent one or more octal digits. It can be used for any Unicode character. @@ -440,7 +440,8 @@ Mnemonic: I<g>roup. /(\w+) \g1/; # Finds a duplicated word, (e.g. "cat cat"). /(\w+) \1/; # Same thing; written old-style. - /(.)(.)\g2\g1/; # Match a four letter palindrome (e.g. "ABBA"). + /(\w+) \g{1}/; # Same, using the safer braced notation + /(.)(.)\g2\g1/; # Match a four letter palindrome (e.g. "ABBA"). =head3 Relative referencing @@ -480,11 +481,11 @@ hyphen. =head4 Examples - /(?<word>\w+) \g{word}/ # Finds duplicated word, (e.g. "cat cat") - /(?<word>\w+) \k{word}/ # Same. - /(?<word>\w+) \k<word>/ # Same. + /(?<word>\w+) \g{word}/ # Finds duplicated word, (e.g. "cat cat") + /(?<word>\w+) \k{word}/ # Same. /(?<letter1>.)(?<letter2>.)\g{letter2}\g{letter1}/ - # Match a four letter palindrome (e.g. "ABBA") + # Match a four letter palindrome (e.g. + # "ABBA") =head2 Assertions @@ -540,7 +541,8 @@ boundary type specified inside the braces. The boundary types are given a few paragraphs below. C<\B{...}> matches at any place between characters where C<\b{...}> of the same type doesn't match. -C<\b> when not immediately followed by a C<"{"> matches at any place +C<\b> when not immediately followed by a C<"{"> is available in all +Perls. It matches at any place between a word (something matched by C<\w>) and a non-word character (C<\W>); C<\B> when not immediately followed by a C<"{"> matches at any place between characters where C<\b> doesn't match. To get better |