Regular Expressions; Table 12-1 Regular Expressions And Special Characters In Rules - Honeywell Rapid Eye Operator's Manual

Customer Devices

Regular Expressions

Character
.
[ ]
^
$
-
+
*
?
\
136
Technical Note on Special Characters
Operators who know how to use a regular expression (RE) benefit most from using the
special characters in a rule.
performing an extended search.
Table 12-1 Regular Expressions and Special Characters in Rules
Name
Period
Square brackets
Caret
Dollar sign
Dash
Plus sign
Asterisk
Question mark
Backslash
lists the special characters that can be used for
Table 12-1
Within the Rule, Searches for a Match to...
Any one character.
Example: .ire finds wire, tire, 4ire, and so on.
Each character in the brackets, in turn.
Example: c[aou]t finds cat, cot or cut.
1. Characters that are not in brackets (Example: r[^a]
finds rb, rc, rA, r1, and so on).
2. A rule at the beginning of a ine, when placed before it
(Example: ^Hume finds only Hume at the beginning
of a line).
3. A control code, when used with a backslash
(Example: \^C find the control-C control code).
A rule at the end of a line, when placed after it.
Example: Kant$ finds only Kant at the end of a line.
A range of characters set in square brackets.
Example: [a-z] matches any lower case letter.
The character that it follows, once or more.
Example: tu+ finds tu, tuu, tuuu, and so on.
The character that it follows, whether absent, occuring
once or more (Example: mo*e finds me, moe, mooe,
moooe, and so on).
Example: c[au]*t finds ct, cat, caat, cut, cuut, and so on.
A character that follows it, whether absent or occuring
once (Example: me?y matches either mey or my).
1. Characters, when placed prior (Example: /? finds ?).
2. Control character, when placed before their symbols
(Example: \e is an escape command, \f is a form feed,
\n is a new line, and so on).