Pretty stupid of me. Thank you. I will try being more careful before commenting next time. Thank you.
When I go to that section, http://www.wolfram.com/language/fast-introduction-for-programmers/en/strings/, I don't see StringReplace["lead",_"gold"], which isn't valid syntax. I see StringReplace["lead",_ -> "gold"]
StringReplace["lead",_"gold"]
StringReplace["lead",_ -> "gold"]
