Strip HTML tags but allow some tags

stripTags.cfm

<cfscript>
/**
 * stripTags
 * removes all html tags from a string (e.g. <p></p>)
 * Inspired by: https://stackoverflow.com/questions/38811076/how-can-i-keep-sup-sub-html-tags-in-my-coldfusion-string-but-get-rid-of-al
 *
 * @input: the string to process
 * @reIgnore: a regex of tags to ignore (e.g. </?su[bp])
*/
function stripTags( required string input, string reIgnore="" ) {
    
    //  regex to capture all tag occurences 
    var stripRegEx = "<[^>]+>";
    var result = createObject("java", "java.lang.StringBuilder").init();
    var matcher  = createObject("java", "java.util.regex.Pattern").compile(stripRegEx).matcher(stringToStrip);
    var last     = 0;
    
    while ( condition=matcher.find() ) {
    	
    	//  append content before next capture 
    	result.append(
            stringToStrip.substring(
                last, 
                matcher.start()
            )
        );
        
    	//  full tag capture 
    	capture = matcher.group(
            javaCast("int", 0)
        );
        
    	//  keep only tags contained within the ignore regex
    	if ( 
    	    len( arguments.reIgnore ) && 
    	    reFindNoCase( arguments.reIgnore, capture ) 
	    ) {
    		result.append( capture );
    	}
    	//  continue at last cursor 
    	last = matcher.end();
    }
    
    //  append remaining content 
    result.append(
        stringToStrip.substring( last )
    );

    return result.toString();

}
</cfscript>