User Guide

Regular Expression Examples 267
Regular Expression Examples
The following examples show some regular expressions and describe what they
match:
Regular expressions in CFML
The following examples of CFML show some common uses of regular expression
functions:
Expression Description
[\?&]value=
A URL parameter value in a URL.
[A-Z]:(\\[A-Z0-9_]+)+
An uppercase DOS/Windows full
path that (a) is not the root of a drive,
and (b) 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, and so on..
Expression Returns
REReplace (CGI.Query_String,
"CFID=[0-9]+[&]*", "")
The query string with parameter CFID and
its numeric value stripped out.
REReplace(“I Love Jellies”,
”[[:lower:]]”,”x”,”ALL”
I Lxxx Jxxxxxx
REReplaceNoCase(“cabaret”,”[A-Z]”,
”G”,”ALL”)
GGGGGGG
REReplace (Report,
"\$[0-9,]*\.[0-9]*", "$***.**")",
"")
The string value of the variable Report with
all positive numbers in the dollar format
changed to "$***.**".