Re: Start and end of line anchors in middle of regexp

I'm Posting for Gilles. He tried to post twice, and it just ended up going to me. The problem is the yahoo groups interface is kind of confusing and poorly designed. The default is to reply to the person, not the group. So the message is easily lost. :( This tripped me up in the past. Now it tripped up someone else. In it's wisdom, the yahoo group interface even "hides" the "To:" box, so the poster is left in the dark. :( You can "unhide" the "To:" box, by clicking on the double arrow symbol, but it's not obvious at all. Anyway, here is the message from Gilles:
 

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 Thanks a lot for answers and details. Quoting GNU sed 4.2.1 manual:
 
"The only difference between basic and extended regular expressions is
 in the behavior of a few characters: ‘?’, ‘+’, parentheses, and braces
 (‘{}’)".

No mention to ^ and $. This could perhaps be added. Are they other known
differences between BRE and ERE?

Thanks again.