I was doing some exercises on regular expressions, but I can't seem to be able to crack this one : egrep in a file where the 2nd and 3rd character are the same. I tried : egrep  '^..{2}' /usr/share/dict/dutchHowever this is wrong, how should I match the 2nd and 3rd character in a regex? How would I match the 2nd and 4th character in a regex (not an exercise, but I would like to know this one as well.)?
Regex : match 2nd and 3rd character
grep;regular expression
You'll need backreferences for the first part: egrep '^.(.)\1'The .{2} simply matches any two characters.  If you want the 2nd and 4th characters the same, it's the same idea as above:egrep '^.(.).\1'