in reply to Re^2: regex issue
in thread regex issue

Yes, I should have used {} all the way: 
s{(\Qhttp://v2vi.click4assistance.co.uk/c4a.aspx?AccNo=Inter12109&
+IDENT=\E)US}{${1}UK}g

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Note that both the pattern and the replacement have their own set of parens. You may write: 
s{(\Qhttp://v2vi.click4assistance.co.uk/c4a.aspx?AccNo=Inter12109&
+IDENT=\E)US}
 {${1}UK}g

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as well.

In Section Seekers of Perl Wisdom