Martin Kahlert wrote:
> irb(main):003:0> s1 =~ /a|b=(.)/
> => 0                              <------ expression matches
> irb(main):004:0> $1
> => nil                            <------ but where is argument?

I assume this is the one you need explanation for? I think you simply 
misinterpret the regexp. /a|b=(.)/ is a union between the two regexp /a/ 
and /b=(.)/. So in this case it matches only the first one which has no 
bindings. The regexp you are probably looking for would be 
/(?:a|b)=(.)/. Try that.

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