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Diffstat (limited to 'pod/perlre.pod')
| -rw-r--r-- | pod/perlre.pod | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/pod/perlre.pod b/pod/perlre.pod index 2e00f0bc69..98aafdd184 100644 --- a/pod/perlre.pod +++ b/pod/perlre.pod @@ -450,11 +450,12 @@ capture group, or the character whose ordinal in octal is 010 (a backspace in ASCII). Perl resolves this ambiguity by interpreting C<\10> as a backreference only if at least 10 left parentheses have opened before it. Likewise C<\11> is a backreference only if at least 11 left parentheses have opened before it. -And so on. C<\1> through C<\9> are always interpreted as backreferences. You -can minimize the ambiguity by always using C<\g> if you mean capturing groups; -and always using 3 digits for octal constants, with the first always "0" (which -works if there are 63 (= \077) or fewer capture groups). There are several -examples below that illustrate these perils. +And so on. C<\1> through C<\9> are always interpreted as backreferences. +There are several examples below that illustrate these perils. You can avoid +the ambiguity by always using C<\g{}> or C<\g> if you mean capturing groups; +and for octal constants always using C<\o{}>, or for C<\077> and below, using 3 +digits padded with leading zeros, since a leading zero implies an octal +constant. The C<\I<digit>> notation also works in certain circumstances outside the pattern. See L</Warning on \1 Instead of $1> below for details.) |