regex function replacement
 

Will Sigil add regex function replacement like Calibre? Or will someone design a plugin like this?

The Sigil Search and Replace has long supported regular expressions. See the Sigil User's manual.

after search&replace in calibre you can compare code before and after replacement, so you can check for regex errors.

Doitsu, pointed out calibre's ability to run python code inside search and replace in regex mode. This is easy for calibre as it is written in python. Sigil's approach would be plugins.

That can not easily be done as Sigil does not use order preserving hashes for retaining attribute order (as attribute order is not significant in xhtml or xml). That type of QHash really does not exist in Qt. Hashes/dicts that retain order are built into python.

This is something on my wish list for Sigil 2.0 not 1.0. That said, a regex replacer "dry-run" sounds like it would be better as a plugin.

anyway, there is a lot programs that do same thing (diffchecker, textcompare...). notepad++ has compare plugin, and in my workflow really does not matter if i do it in calibre, sigil or notepad++.
thanx for fast answer.