Updated Scripting Language (markdown)

Scripting-Language.md

@@ -24,6 +24,7 @@ SDCARD_DIR | enables support for web UI for SD card directory upload and downloa
 USE_24C256 | enables use of 24C256 I<sup>2</sup>C EEPROM to expand script buffer (defaults to 4k)  
 SUPPORT_MQTT_EVENT | enables support for subscribe unsubscribe  
 USE_TOUCH_BUTTONS | enable virtual touch button support with touch displays
+USE_WEBSEND_RESPONSE | enable receiving the response of a websend command (received in section E)
 
 <BR><BR>To enter a script, go to `Configuration` =\> `Edit script` in the Tasmota web UI menu
 
@@ -126,6 +127,8 @@ If a Tasmota `SENSOR` or `STATUS` or `RESULT` message is not generated or a `Var
 `int(x)` = gets the integer part of x (like floor)  
 `hn(x)` = converts x (0..255) to a hex nibble string  
 `st(svar c n)` = string token - retrieve the n<sup>th</sup> element of svar delimited by c  
+`sl(svar)` = gets the length of a string  
+`sb(svar p n)` = gets a substring from svar at position p (if p<0 counts from end) and length n  
 `s(x)` = explicit conversion from number x to string  
 `mqtts` = MQTT connection status: `0` = disconnected, `>0` = connected  
 `wifis` = Wi-Fi connection status: `0` = disconnected, `>0` = connected  
@@ -168,7 +171,7 @@ If you define a variable with the same name as a special variable that special v
 - A single percent sign must be given as `%%`  
 
 **Special** commands:  
-`=> print` prints to the log for debugging  
+`print` or `=> print` prints to the log for debugging  
 &nbsp;&nbsp;&nbsp;&nbsp;A Tasmota MQTT RESULT message invokes the script's `>E` section. Add `=> print` statements to debug a script.  
     
 - Example:  
@@ -200,6 +203,7 @@ If you define a variable with the same name as a special variable that special v
 `#name(param)` names a subroutines with a parameter is called with `=#name(param)`  
 Subroutines end with the next `#` or `>` line or break. May be nested  
 Parameters can be numbers or strings and on mismatch are converted  
+`=(svar)`executes a script in a string variable (dynamic or self modifying code)  
 
 **For loop** (loop count must not be less than 1)
 ```