CFLib.org – Common Function Library Project

MidString(string, from[, to])

Last updated November 2, 2001

author

Andrew Cripps

Version: 1 | Requires: CF5 | Library: StrLib

Description:
The Midstring function returns the middle string between two substrings. The from and to strings should be unique in the string from which you want the substring because the function only looks for the first match of each string. So if you have string "ApplePearApple" and enter "Apple" as both the to and the from string, you will get an empty string back. Note that all strings are case sensitive.

Return Values:
Returns the string between the delimiters.

Example:

<cfset string="ApplePearPlum">
<cfset fromstr="Apple">
<cfset tostr="Plum">
<cfset result = midstring(string,fromstr,tostr)>
<cfoutput>
string=#string#<BR>
Mid from Apple to Plum = #result#<BR>
</cfoutput>
<cfset string="ApplePearPlumApple">
<cfset fromstr="Apple">
<cfset result = midstring(string,fromstr)>
<cfoutput>
string=#string#<BR>
Mid using only Apple  = #result#
</cfoutput>

Parameters:

Name Description Required
string The string to check. Yes
from The initial string to use as a delimiter. Yes
to The ending string to use as a delimiter. No

Full UDF Source:

/**
 * Midstring: Return the middle part of a string between a specified start substring and a specified end substring.
 * 
 * @param string 	 The string to check. 
 * @param from 	 The initial string to use as a delimiter. 
 * @param to 	 The ending string to use as a delimiter. 
 * @return Returns the string between the delimiters. 
 * @author Andrew Cripps (andrew@cripps.net) 
 * @version 1, December 3, 2001 
 */
function midstring(string,from) {
	var start="";
	var end="";
	var lenstart="";
	var to=from;
	
	if(arrayLen(arguments) gte 3) to = arguments[3];
	
	start = refind(from,string);
	end = refind(to,string,len(from)+start);
	lenstart = len(from);
	return mid(string,start+lenstart,max(end-start-lenstart,0));
	
}
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