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Thanks very much, I really appreatiate your help

It does work, but I couldn't figure out what the ^ and * do? could you
explain that in more detail?

Thanks


2006/1/17, ara.t.howard / noaa.gov <ara.t.howard / noaa.gov>:
>
> On Tue, 17 Jan 2006, Eric Luo wrote:
>
> > Thanks for your replay.
> >
> > To make the problem clear.
> > I want to only change the regular expression, but not the code to
> implement
> > this function.
> > Actually, the regular expression comes from a configurable table. I'll
> be
> > supposed to only have the privilege to update the table.
> >
> > So What I really want is a alternative way to in place of the regular
> > expression
> > (?<!STR )SNPB
>
>    harp:~ > cat a.rb
>    strings = "STR SNPB", "STR", "SNPB"
>
>    re = %r/^ (?: (?:[^S]) | (?:S[^T]) | (?:ST[^R]) )* SNPB /ox
>
>    strings.each do |string|
>      permutations = string, "foo #{ string }", "#{ string } bar", "foo #{
> string } bar"
>      permutations.each do |permutation|
>        puts "<#{ permutation }> matches" if re.match permutation
>      end
>    end
>
>    harp:~ > ruby a.rb
>    <SNPB> matches
>    <foo SNPB> matches
>    <SNPB bar> matches
>    <foo SNPB bar> matches
>
> hth.
>
> -a
> --
> strong and healthy, who thinks of sickness until it strikes like
> lightning?
> preoccupied with the world, who thinks of death, until it arrives like
> thunder?  -- milarepa
>
>
>

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