about getting newstr

Questions
1

two questions with regex:
1.

str = "HelloWorldabcCodea"

i wanna get:

newstr1 = "HelloWorldabc"
newstr2 = "Codea"

str = "qw/ertyui/o/pabcdefgh/ias/dfgh"

i wanna get after the 3rd ‘/’

newstr = "pabcdefgh/ias/dfgh"
2

and how many ‘/’ in str?

3

@firewolf, from what I can tell, you should look at the string library in the reference

4

i wonder how to make it with one regex statement, i know how to make it with a few statements.

5

question 1. i must make use of “abc” as match

6

Since your question is about Lua itself, Googling something usually brings up an answer.

http://lua-users.org/wiki/PatternsTutorial

At the bottom of that page, it has something similar to what you want.

7

@firewolf there is no regexp in lua, but patterns instead. They are a bit tricky to master, but they do the job and are very quick. Check
http://codea.io/talk/discussion/5605/patterns-tutorial