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94 Chapter 7 Using Web Development Languages
Expression examples
The following table shows some regular expressions and describes what they match:
Expression Description
[\?&]value= A URL parameter value in a URL
[A-Z]:(\\[A-Z0-9_]+)+
An uppercase DOS/Windows full path that is not the
root of a drive, and that has only letters, numbers,
and underscores in its text
[A-Za-z][A-Za-z0-9_]* A ColdFusion variable with no qualifier
([A-Za-z][A-Za-z0-9_]*)(\
.[A-Za-z][A-Za-z0-9_]*)?
A ColdFusion variable with no more than one
qualifier, for example, Form.VarName, but not
Form.Image.VarName
(\+|-)?[1-9][0-9]* An integer that does not begin with a zero and has an
optional sign
(\+|-)?[1-9][0-9]*(\.[0-9
]*)? A real number
(\+|-)?[1-9]\.[0-9]*E(\+|
-)?[0-9]+ A real number in engineering notation
a{2,4} Two to four occurrences of “a”: aa, aaa, aaaa
(ba){3,}
At least three “ba” pairs: bababa, babababa, ...
(" [A-Za-z] "){2,} At least two occurrences of the same word