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REReplace
Last update:
May 18, 2026
Description
Uses a regular expression (RE) to search a string for a string pattern and replace it with another. The search is case sensitive.
Returns
If the scope parameter is set to one, returns a string with the first occurrence of the regular expression replaced by the value of substring. If the scope parameter is set to all, returns a string with all occurrences of the regular expression replaced by the value of substring. If the function finds no matches, it returns a copy of the string unchanged.
Syntax
REReplace(string,regex,substring,[scope])Category
See also
History
ColdFusion (2018 release) Update 5: Added the flag useJavaAsRegexEngine to Application.cfc. Enable this flag to use Java Regex as the default regex engine. For more information, see Application variables. For information on using Regular Expression using the flag, see Using Regular Expressions.
ColdFusion MX: Added supports for the following special codes in a replacement substring, to control case conversion:
- \u - uppercase the next character
- \l - lowercase the next character
- \U - uppercase until \E
- \L - lowercase until \E
- \E - end \U or \L For more information on new features, see REFind.
Parameters
Parameter | Description |
string | A string or a variable that contains one. String within which to search. |
regex | Regular expression to replace. The search is case sensitive. |
substring | A string or a variable that contains one. Replaces reg_expression. Also takes a callback function as an argument. |
scope |
|
Usage
For details on using regular expressions, see Using Regular Expressions in Functions in the Developing ColdFusion Applications.
Example 1
<cfscript>
writeOutput(REReplace("CABARET","C|B","G","ALL") & "<br/>")
writeOutput(REReplace("CABARET","C|B","G","ALL") & "<br/>")
writeOutput(REReplace("CABARET","[A-Z]","G","ALL") & "<br/>")
writeOutput(REReplace("CABARET","[A-Z]","G","ALL") & "<br/>")
writeOutput(REReplace("I love jellies","jell(y|ies)","cookies") & "<br/>")
writeOutput(REReplace("I love jellies","jell(y|ies)","cookies") & "<br/>")
writeOutput(REReplace("I love jelly","jell(y|ies)","cookies") & "<br/>")
writeOutput(REReplace("I love jelly","jell(y|ies)","cookies") & "<br/>")
</cfscript>EXAMPLE 2
<cfscript>
myStr = "PROSPER";
outStr = reReplace( myStr, "P|S", function (transform, position, original, Count){
writeOutput(Count)
return "G";
}, "all");
writeoutput(outStr);
</cfscript>Output
123GROGGER
EXAMPLE 3
<cfscript>
myStr = "PROSPER";
outStr = reReplace( myStr, "P|S", function (transform, position, original, Count){
writeOutput(Count)
return "G";
}, "one");
writeoutput(outStr);
</cfscript>
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