Meta Characters In The Regular Expressions - Siemens SINUMERIK 840D sl Operating Manual

Create MyConfig - Diff
A Use of regular expressions in Diff
A.2

Meta characters in the regular expressions

The most important meta characters are shown in the following subsections which are
contained in the dialect of the regular expressions of Create MyConfig.
Character classes
In a regular expression, a character class defines
characters contained in the character class.
Meta charac‐
ters
[0-9a-fAF]
86
Corresponds to any character with the exception of \n (line break).
.
A character set available for selection can be defined using square brackets. The
[ ]
expression in the square brackets precisely stands for one character from this selec‐
tion.
Corresponds to
[acdb]
string. This means one a, one b, one c or one d. The sequence of the characters
within the character class is of no significance.
Corresponds to any, individual character which is
[^acdb]
acter string. If a ^ is not located at the beginning of the definition, then it should be
considered as literal.
For "character negation" the ^ can only be located
here, in turn, may only be used at the
Outside a square bracket, ^ has a different meaning, see below: "Constructs".
Adjacent characters can be specified as a range by using a hyphen.
If the hyphen is written at the beginning or at the end of the character class or with
backslash, i.e. \- then it stands for itself and is not valid as specifying a range.
A character which is a letter, a number or an underscore.
\w
A character which is neither a letter, number nor underscore.
\W
Corresponds to any space character, i.e. space character, tabulator, line feed spec‐
\s
trum.
Corresponds to any non-space characters.
\S
Corresponds to any decimal number, corresponds to [0-9].
\d
Corresponds to any non number, corresponds to [^0-9].
\D
Corresponds to a tab stop character.
\t
Corresponds to a line break.
\n
Corresponds to an ASCII character in the hexadecimal notation (precisely two posi‐
\x20
tions).
Corresponds to a unicode character in the hexadecimal notation (precisely four po‐
\u0020
sitions).
one character, which may be one of the
Description
one single character which is contained in the specified character
beginning !
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not contained in the specified char‐
within the square brackets and
Operating Manual, 11/2016, A5E36537479B-AD