Installation and Getting Started Guide
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$ A dollar sign matches on the end of an input string.
For example, the following regular expression matches output that ends with “deg”:
deg$
_ An underscore matches on one or more of the following:
• , (comma)
• { (left curly brace)
• } (right curly brace)
• ( (left parenthesis)
• ) (right parenthesis)
• The beginning of the input string
• The end of the input string
• A blank space
For example, the following regular expression matches on “100” but not on “1002”, “2100”,
and so on.
_100_
[ ] Square brackets enclose a range of single-character patterns.
For example, the following regular expression matches output that contains “1”, “2”, “3”, “4”,
or “5”:
[1-5]
You can use the following expression symbols within the brackets. These symbols are
allowed only inside the brackets.
• ^ – The caret matches on any characters
except
the ones in the brackets. For
example, the following regular expression matches output that does
not
contain “1”,
“2”, “3”, “4”, or “5”:
[^1-5]
• - The hyphen separates the beginning and ending of a range of characters. A match
occurs if any of the characters within the range is present. See the example above.
| A vertical bar separates two alternative values or sets of values. The output can match one
or the other value.
For example, the following regular expression matches output that contains either “abc” or
“defg”:
abc|defg
( ) Parentheses allow you to create complex expressions.
For example, the following complex expression matches on “abc”, “abcabc”, or “defg”, but
not on “abcdefgdefg”:
((abc)+)|((defg)?)
Table 2.4: Special Characters for Regular Expressions (Continued)
Character Operation
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