Hello:
(exp) : match "exp",the matched text is stored in auto named arrays.
How can I get the matched text ? What is the name of the auto named arrays on linux shell ?
In what context? I'm not sure which "exp" you're talking about.
Sorry, I can not express myself in detail.
Then I'm sorry, the vague question has me baffled.
"the matched text is stored in auto named arrays" - Google - only one result. 
Likely it's an output from a homemade script.