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Diffstat (limited to 'docs/reference/glib/regex-syntax.xml')
| -rw-r--r-- | docs/reference/glib/regex-syntax.xml | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/docs/reference/glib/regex-syntax.xml b/docs/reference/glib/regex-syntax.xml index 5dd92917a..0b413aa02 100644 --- a/docs/reference/glib/regex-syntax.xml +++ b/docs/reference/glib/regex-syntax.xml @@ -2442,52 +2442,6 @@ processing option does not affect the called subpattern. </para> </refsect1> -<!-- Callouts are not supported by GRegex -<refsect1> -<title>Callouts</title> -<para> -Perl has a feature whereby using the sequence (?{...}) causes arbitrary -Perl code to be obeyed in the middle of matching a regular expression. -This makes it possible, amongst other things, to extract different substrings that match the same pair of parentheses when there is a repetition. -</para> - -<para> -PCRE provides a similar feature, but of course it cannot obey arbitrary -Perl code. The feature is called "callout". The caller of PCRE provides -an external function by putting its entry point in the global variable -pcre_callout. By default, this variable contains NULL, which disables -all calling out. -</para> - -<para> -Within a regular expression, (?C) indicates the points at which the -external function is to be called. If you want to identify different -callout points, you can put a number less than 256 after the letter C. -The default value is zero. For example, this pattern has two callout -points: -</para> - -<programlisting> -(?C1)abc(?C2)def -</programlisting> - -<para> -If the PCRE_AUTO_CALLOUT flag is passed to pcre_compile(), callouts are -automatically installed before each item in the pattern. They are all -numbered 255. -</para> - -<para> -During matching, when PCRE reaches a callout point (and pcre_callout is -set), the external function is called. It is provided with the number -of the callout, the position in the pattern, and, optionally, one item -of data originally supplied by the caller of pcre_exec(). The callout -function may cause matching to proceed, to backtrack, or to fail altogether. A complete description of the interface to the callout function -is given in the pcrecallout documentation. -</para> -</refsect1> ---> - <refsect1> <title>Copyright</title> <para> |