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22 lines
1.7 KiB
XML
22 lines
1.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<chapter xmlns="urn:lighttpd.net:lighttpd2/doc1" title="Regular expressions">
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<description>
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<textile>
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lighttpd2 uses the "Perl-compatible regular expressions" implementation from GLib, see their "Regular expression syntax":https://developer.gnome.org/glib/stable/glib-regex-syntax.html documentation.
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The config format has different ways to provide strings (you can quote with either @'@ or @"@; the character used to quote has to be escaped with @\@ if used inside the string).
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The simple (standard) way @"text"@ has the following escape rules:
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* @"\n"@ is a newline, @"\r"@ a carriage return, @"\t"@ a tab stop
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* @"\\"@ is one @\@, @"\""@ is one double quote @"@ and @"\'"@ a single quote @'@
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* escaping single/double quote is optional if the symbol is not used to terminate the string, i.e. @'\"'@ = @'"'@ and @"\'"@ = @"'"@
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* @"\xNN"@: NN must be hexadecimal characters, and the string is replaced with the decoded 8-bit value as a single byte
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* All other @\@ occurences are *not* removed from the string.
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This way is the preferred one for regular expressions; only to actually match a @\@ you have to do additional escaping (@"\\\\"@; @"\x5C"@ = @"\\"@ is not working), and @\\@ is usually not doing what you wanted (matching a digit: @"\\d"@ = @"\d"@). All other escape rules are compatible with what pcre is doing.
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The second way is to place an @e@ before the string like this: @e"text"@. It has the same rules like the normal string, but does not allow unknown escape sequences (the last rule above).
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To match a digit with pcre this way you'd have to write @e"\\d"@ instead of @"\d"@.
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</textile>
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</description>
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</chapter>
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