Teledyne Dock Server, User Manual

Page: 214 / 228

Revision 7.10 2/28/2012
XY X followed by Y
X
|
Y Either X or Y
(
X
)
X, as a capturing group
Back references
\
n Whatever the n
th
capturing group matched
Quotation
\
Nothing, but quotes the following character
\Q Nothing, but quotes all characters until
\E
\E
Nothing, but ends quoting started by
\Q
Special constructs (non­capturing)
(?:
X
)
X , as a non­capturing group
(?idmsux-idmsux)
Nothing, but turns match flags on ­ off
(?idmsux-idmsux:
X
)
X , as a non­capturing group with the given flags on ­ off
(?=
X
)
X , via zero­width positive lookahead
(?!
X
)
X , via zero­width negative lookahead
(?<=
X
)
X , via zero­width positive lookbehind
(?<!
X
)
X , via zero­width negative lookbehind
(?>
X
)
X , as an independent, non­capturing group
Backslashes, escapes, and quoting
The backslash character (
'\'
) serves to introduce escaped constructs, as defined in the table
above, as well as to quote characters that otherwise would be interpreted as unescaped
constructs. Thus the expression
\\
matches a single backslash and
\{
matches a left brace.
It is an error to use a backslash prior to any alphabetic character that does not denote an escaped
construct; these are reserved for future extensions to the regular­expression language. A
backslash may be used prior to a non­alphabetic character regardless of whether that character is
part of an unescaped construct.
Backslashes within string literals in Java source code are interpreted as required by the Java
Language Specification as either Unicode escapes or other character escapes . It is therefore
necessary to double backslashes in string literals that represent regular expressions to protect
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