perlreref.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "PERLREREF 1"
.TH PERLREREF 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
perlreref \- Perl Regular Expressions Reference
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a quick reference to Perl's regular expressions.
For full information see perlre and perlop, as well
as the \*(L"\s-1SEE\s0 \s-1ALSO\s0\*(R" section in this document.
.Sh "\s-1OPERATORS\s0"
.IX Subsection "OPERATORS"
\&\f(CW\*(C`=~\*(C'\fR determines to which variable the regex is applied.
In its absence, \f(CW$_\fR is used.
.PP
.Vb 1
\&    $var =~ /foo/;
.Ve
.PP
\&\f(CW\*(C`!~\*(C'\fR determines to which variable the regex is applied,
and negates the result of the match; it returns
false if the match succeeds, and true if it fails.
.PP
.Vb 1
\&    $var !~ /foo/;
.Ve
.PP
\&\f(CW\*(C`m/pattern/msixpogc\*(C'\fR searches a string for a pattern match,
applying the given options.
.PP
.Vb 9
\&    m  Multiline mode \- ^ and $ match internal lines
\&    s  match as a Single line \- . matches \en
\&    i  case\-Insensitive
\&    x  eXtended legibility \- free whitespace and comments
\&    p  Preserve a copy of the matched string \-
\&       ${^PREMATCH}, ${^MATCH}, ${^POSTMATCH} will be defined.
\&    o  compile pattern Once
\&    g  Global \- all occurrences
\&    c  don\*(Aqt reset pos on failed matches when using /g
.Ve
.PP
If 'pattern' is an empty string, the last \fIsuccessfully\fR matched
regex is used. Delimiters other than '/' may be used for both this
operator and the following ones. The leading \f(CW\*(C`m\*(C'\fR can be omitted
if the delimiter is '/'.
.PP
\&\f(CW\*(C`qr/pattern/msixpo\*(C'\fR lets you store a regex in a variable,
or pass one around. Modifiers as for \f(CW\*(C`m//\*(C'\fR, and are stored
within the regex.
.PP
\&\f(CW\*(C`s/pattern/replacement/msixpogce\*(C'\fR substitutes matches of
\&'pattern' with 'replacement'. Modifiers as for \f(CW\*(C`m//\*(C'\fR,
with one addition:
.PP
.Vb 1
\&    e  Evaluate \*(Aqreplacement\*(Aq as an expression
.Ve
.PP
\&'e' may be specified multiple times. 'replacement' is interpreted
as a double quoted string unless a single-quote (\f(CW\*(C`\*(Aq\*(C'\fR) is the delimiter.
.PP
\&\f(CW\*(C`?pattern?\*(C'\fR is like \f(CW\*(C`m/pattern/\*(C'\fR but matches only once. No alternate
delimiters can be used.  Must be reset with \fIreset()\fR.
.Sh "\s-1SYNTAX\s0"
.IX Subsection "SYNTAX"
.Vb 10
\&   \e       Escapes the character immediately following it
\&   .       Matches any single character except a newline (unless /s is used)
\&   ^       Matches at the beginning of the string (or line, if /m is used)
\&   $       Matches at the end of the string (or line, if /m is used)
\&   *       Matches the preceding element 0 or more times
\&   +       Matches the preceding element 1 or more times
\&   ?       Matches the preceding element 0 or 1 times
\&   {...}   Specifies a range of occurrences for the element preceding it
\&   [...]   Matches any one of the characters contained within the brackets
\&   (...)   Groups subexpressions for capturing to $1, $2...
\&   (?:...) Groups subexpressions without capturing (cluster)
\&   |       Matches either the subexpression preceding or following it
\&   \e1, \e2, \e3 ...           Matches the text from the Nth group
\&   \eg1 or \eg{1}, \eg2 ...    Matches the text from the Nth group
\&   \eg\-1 or \eg{\-1}, \eg\-2 ... Matches the text from the Nth previous group
\&   \eg{name}     Named backreference
\&   \ek<name>     Named backreference
\&   \ek\*(Aqname\*(Aq     Named backreference
\&   (?P=name)    Named backreference (python syntax)
.Ve
.Sh "\s-1ESCAPE\s0 \s-1SEQUENCES\s0"
.IX Subsection "ESCAPE SEQUENCES"
These work as in normal strings.
.PP
.Vb 11
\&   \ea       Alarm (beep)
\&   \ee       Escape
\&   \ef       Formfeed
\&   \en       Newline
\&   \er       Carriage return
\&   \et       Tab
\&   \e037     Any octal ASCII value
\&   \ex7f     Any hexadecimal ASCII value
\&   \ex{263a} A wide hexadecimal value
\&   \ecx      Control\-x
\&   \eN{name} A named character
\&
\&   \el  Lowercase next character
\&   \eu  Titlecase next character
\&   \eL  Lowercase until \eE
\&   \eU  Uppercase until \eE
\&   \eQ  Disable pattern metacharacters until \eE
\&   \eE  End modification
.Ve