I am writing a method to strip out <a> (the link tag) from input text,
and I use the  gsub method to do the job:
>>str = "please vist <a href=""http://www.abc.com"" title=""abc"">abc.com</a> for more info."
>>str.gsub(Regexp.new("<\/?a(.)*?>"), "")
>>=>"please vist abc.com for more info."

It seems work well, but I'm not confident that the (.)* will safelly
match all the characters inside a <a> tag, for example, what if there is
a new line?
So, for ruby regex, which symbol can be surely used to represent any
character of a string? Thanks.
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