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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:
The following examples show some regular expressions and describe what they match.
Regular Expression Examples | |
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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, ... |
The following examples of CFML show some common uses of regular expression functions.
Examples of Regular Expression Functions | |
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Expression |
Description |
REReplace (CGI.Query_String, "CFID=[0-9]+[&]*", "") |
Returns 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]*", "$***.**")", "") |
Returns the string value of the variable Report with all positive numbers in the dollar format changed to "$***.**". |
REFind ("[Uu]\.?[Ss]\.?[Aa}\.?", Report ) |
Finds the position of the first occurrence of the abbreviation USA in the variable Report. |
REFindNoCase("a+c","ABCAACCDD") |
4 |
REReplace("There is is coffee in the the kitchen","([A-Za-z]+) [ ]+\1","*","ALL") |
There * coffee in * kitchen |
REReplace(report, "<[^>]*>", "", "All") |
Removes all HTML tags from a string value of the report variable. |
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