Regex search/replace

nobodythere

Hi all, I'm trying to get my head around regular expressions but it's proving difficult. I was hoping someone would save me many times and help me out here:

<img src="/images/F.gif" style="margin-right: -25px; padding: 0;" alt="F" />

that "F" could be any letter, and I want to search and replace that whole <img> thing with just "F" (or whatever letter there is).

Help please

daymobrew

$ echo '<img src="/images/F.gif" style="margin-right: -25px; padding: 0;" alt="F" />' | sed 's/.* alt="\([a-zA-Z]\)".*/\1/'
F

This extracts the character in the 'alt' part.

What language are you trying to do this in? The regex syntax will be similar for most languages.

nobodythere

Thanks got it sorted, I was trying to use %1 as a backreference but in PHP it's \\1