Find and replace in 1.1b5-- search for \t, replace with \s, regex
box checked, looking in selected text. I got "s" instead of space: 3 Union Street 3sUnionsStreet
I think you've misunderstood the regex characters: \s means "any single horizontal whitespace character", such as a tab or a space. You can't use this as a replacement character (it's *not* a character), just use a literal space instead. (ie, just type in a space for the replacement character.)
Cheers, Paul
[[I have no idea re the <H3> </H3> thing: entering "3" then a tab produces a 3 followed by a tab for me!]]