sorry to trouble here.
when I write " io. " in codea, there are " close , flush, input , lines open —read—write "etc shown.
but cannot find reference in codea. where can I find the explaination of above. ?
this is found when I want to do something on txt file. is there a easy way to handle line in txt file ?
my text is normally like this
[00:00.00]Unit one Hello! \  [00:04.80]Hello! I'm Zoom. \  [00:07.82]Hi! My name's Zip.  [00:11.11]Hello! I'm Mike. \  [00:15.68]Hi, I'm Wu Yifan.\  [00:18.52]Hello, I'm Chen Jie. \  [00:21.50]What's your name? \  [00:23.05]My name's Sarah.\  [00:25.82]Goodbye! \  [00:27.88]Bye, Miss White! \ 
if not, is it possible to handle the panttern with variable toghter ? such as :
I have a variable
str = “101” – 101 is in variable as it could be 102,103,104 etc. as text above.
if I want to get something concerned with 101, then I need to get position of first  and the second , then I can get the texts btw them . also I can get others btw 2*
(for this target, I hv to add too many  in the text file, then I can get what I want. )
to get  , I need to make a pattern. but I tried many way, still cannot put the variable name / the str in pattern. is it impossible ?
(acturally I already solved this by my way. I cut all texts into different txt files. then I need not put so many  etc in text. also good for my classes. but I found above and still want to solve for later. )
thanks much for your help.