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Documentation update for new PCRE2_EXTRA caseless and ASCII options

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Philip Hazel
2023-02-04 17:19:56 +00:00
parent 9c905ce0c1
commit 6bf8045997
18 changed files with 2797 additions and 2538 deletions
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15
doc/html/pcre2syntax.html
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@@ -136,7 +136,8 @@ or in the 16-bit and 32-bit libraries. However, if locale-specific matching is
happening, \s and \w may also match characters with code points in the range
128-255. If the PCRE2_UCP option is set, the behaviour of these escape
sequences is changed to use Unicode properties and they match many more
characters.
characters, but there are some option settings that can restrict individual
sequences to matching only ASCII characters.
</P>
<P>
Property descriptions in \p and \P are matched caselessly; hyphens,
@@ -373,16 +374,22 @@ both cases, a name must not start with a digit.
Changes of these options within a group are automatically cancelled at the end
of the group.
<pre>
(?a) all ASCII options
(?aD) restrict \d to ASCII, even in UCP mode
(?aS) restrict \s to ASCII, even in UCP mode
(?aW) restrict \w to ASCII, even in UCP mode
(?aP) restrict POSIX classes to ASCII even in UCP mode
(?i) caseless
(?J) allow duplicate named groups
(?m) multiline
(?n) no auto capture
(?r) restrict caseless to either ASCII or non-ASCII
(?s) single line (dotall)
(?U) default ungreedy (lazy)
(?x) extended: ignore white space except in classes
(?xx) as (?x) but also ignore space and tab in classes
(?-...) unset option(s)
(?^) unset imnsx options
(?^) unset imnrsx options
</pre>
Unsetting x or xx unsets both. Several options may be set at once, and a
mixture of setting and unsetting such as (?i-x) is allowed, but there may be
@@ -592,9 +599,9 @@ Cambridge, England.
</P>
<br><a name="SEC31" href="#TOC1">REVISION</a><br>
<P>
Last updated: 12 January 2022
Last updated: 04 February 2023
<br>
Copyright &copy; 1997-2022 University of Cambridge.
Copyright &copy; 1997-2023 University of Cambridge.
<br>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.