TryCF Gist

trycf-gist-1773242920261-c0294cf1-60b8-dd9c-bb0f-b75b0e2834d5.cfm

<cfscript>

rc = {
    "key0": "hello%252520world87%%20test",
    "key1": "hello%252520world",
    "key2": "hello%2520world 87%25"
}

rc.each( ( key, value ) => {
    if ( !isNull( value ) && isSimpleValue( value ) ) {
        rc[key] = rc[key].toString().reReplace( "%(?![0-9A-Fa-f]{2})", "%2525", "all" );
        if ( rc[key].reFind( "%[0-9A-Fa-f]{2}" ) ) rc[key] = urlDecode( rc[key] );

        rc[key] = rc[key].toString().reReplace( "%(?![0-9A-Fa-f]{2})", "%2525", "all" );
        if ( rc[key].reFind( "%[0-9A-Fa-f]{2}" ) ) rc[key] = urlDecode( rc[key] );
    }
} );

dump( rc );
</cfscript>