Regular expression, finding a string contains but not starts with

I'm working on parsing a text file, running through each line, and I'm having trouble figuring out the Regex. Part of this parsing involves changing occurances such as:

É to é

I've tried the following regular expression, but it doesn't return anything:

/^(?!&开发者_StackOverflow社区)(É)/

Any suggestions?

So you want to match É only if it's not at the start of the line?

Use

/(?<=.)&Eacute;/

(assuming Ruby 1.9 because 1.8 doesn't support lookbehind)

Rationale: . matches any character except newline. So if the lookbehind assertion matches, we're not at the start of the line.

If you are using Ruby 1.9, you can use a lookbehind like this:

t.gsub! /(?<=.)&Eacute;/, '&eacute;'

In Ruby 1.8, you need to resort to something like this:

while t =~ /(.)É/
    t.sub! /(.)É/, "#{$1}é"
end

where t is your string to be modified.

If you want to match É anywhere on the line, but not on the first position:

/^.+(É)/

This matches e.g. "abcÉdef", but not "É"

UPDATE: fixed errors pointed out by Tim