This function will return the character position of an instance of a sub-string within a string, or 0 if it's not found at all. One use for this is for filtering words that may be considered offensive, or for finding the correct place to insert some text into another string.
|substr||The substring to look for in the string.|
if string_pos(",", text) != 0
string_insert(name, text, string_pos(",", text));
The above code searches the string "text" for a comma, and if it finds one it inserts the substring "name" at that position.