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Anchoring a Regular Expression to a String
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All or part of a regular expression can be anchored to either the beginning or end of the string being searched:
- If the caret (^) is at the beginning of a (sub)expression, the matched string must be at the beginning of the string being searched.
- If the dollar sign ($) is at the end of a (sub)expression, the matched string must be at the end of the string being searched.
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Regular expression examples |
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The following examples show some regular expressions and describe what they match.
Regular Expression Examples
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Expression
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Description
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[\?&]value=
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A URL parameter value in a URL.
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[A-Z]:(\\[A-Z0-9_]+)+
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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.
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[A-Za-z][A-Za-z0-9_]*
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A ColdFusion variable with no qualifier.
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([A-Za-z][A-Za-z0-9_]*)(\.[A-Za-z][A-Za-
z0-9_]*)?
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A ColdFusion variable with no more than one qualifier, for example, Form.VarName, but not Form.Image.VarName.
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(\+|-)?[1-9][0-9]*
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An integer that does not begin with a zero and has an optional sign.
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(\+|-)?[1-9][0-9]*(\.[0-9]*)?
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A real number.
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(\+|-)?[1-9]\.[0-9]*E(\+|-)?[0-9]+
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A real number in engineering notation.
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a{2,4}
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Two to four occurrences of 'a': aa, aaa, aaaa.
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(ba){3,}
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At least three 'ba' pairs: bababa, babababa, ...
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Regular expressions in CFML |
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The following examples of CFML show some common uses of regular expression functions.
Examples of Regular Expression Functions
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Expression
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Description
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REReplace (CGI.Query_String,
"CFID=[0-9]+[&]*", "")
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Returns the query string with parameter CFID and its numeric value stripped out.
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REReplace("I Love Jellies",
"[[:lower:]]","x","ALL"
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I Lxxx Jxxxxxx
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REReplaceNoCase("cabaret","[A-Z]",
"G","ALL")
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GGGGGGG
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REReplace (Report, "\$[0-9,]*\.[0-
9]*", "$***.**")", "")
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Returns the string value of the variable Report with all positive numbers in the dollar format changed to "$***.**".
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REFind ("[Uu]\.?[Ss]\.?[Aa}\.?",
Report )
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Finds the position of the first occurrence of the abbreviation USA in the variable Report.
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REFindNoCase("a+c","ABCAACCDD")
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4
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REReplace("There is is coffee in
the the kitchen","([A-Za-z]+)
[ ]+\1","*","ALL")
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There * coffee in * kitchen
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REReplace(report, "<[^>]*>", "",
"All")
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Removes all HTML tags from a string value of the report variable.
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Copyright © 1998, Allaire Corporation. All rights reserved.
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