regular expresions

[agc]

I am checkin the reg exp but are there site with examples about them? 
like for example I want to find the very first word tha is always in the 
next line after a line with only underscores, someting like>

______________

hy

so I would like to know wich woud be the reg exp for a case like that.... 
where are examples? fro a beguinner? can any one give me a hand with 
this? cheers

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