Replace multiple special character HTML using regex - html

Question

I'm trying to replace some strings using regex in HTML, but there are Swedish characters that make my life difficult.
It starts off looking like this (I'm using dummy text instead of the real Swedish):
<td class="swedish">abc defgå hijk lmnopä</td>
<td><?php audioButton("../../audio/lessons/01/some_old_text","some_old_text"); ?></td>
<td><?php audioButton("../../audio/lessons/01/slow/some_old_text_slx","some_old_text_slx","1"); ?></td>
Step 1: I manage to place the string in the first tag inside the audiobutton, so it looks like this:
<td class="swedish">abc defgå hijk lmnopä</td>
<td><?php audioButton("../../audio/lessons/01/abc defgå hijk lmnopä","abc defgå hijk lmnopä"); ?></td>
<td><?php audioButton("../../audio/lessons/01/slow/abc defgå hijk lmnopä_slx","abc defgå hijk lmnopä_slx","1"); ?></td>
You don't have to read this, but I did it with the following:
Find
<td class="swedish">(.*)</td>\n.*<td><\?php audioButton\("(.*)/.*",".*"\); \?></td>\n.*<td><\?php audioButton\("(.*)/.*",".*","1"\); \?></td>
Replace
<td class="swedish">$1</td>
<td><?php audioButton("$2/$1","$1"); ?></td>
<td><?php audioButton("$3/$1_slx","$1_slx","1");?></td>
It's fairly straightforward, even for a noob like myself.
Step 2: Now this is where my problems begin. The Swedish characters ä, ö and å have special codes in HTML (ä - ö and å). I have to replace each instance of that code with ae, oe and aa respectively, and put an underscore between each word. This has to happen inside the audiobutton only.
The final result has to look like this:
<td class="swedish">abc defgå hijk lmnopä</td>
<td><?php audioButton("../../audio/lessons/01/abc_defgaa_hijk_lmnopae","abc_defgaa_hijk_lmnopae"); ?></td>
<td><?php audioButton("../../audio/lessons/01/slow/abc_defgaa_hijk_lmnopae_slx","abc_defgaa_hijk_lmnopae_slx","1"); ?></td>
This is where my regex literacy fails me. It's probably really simple, but I can't see it. I would really appreciate some help. It would be especially great if I can do the whole thing in one step instead of two.

Answer 1

Here's a bash loop that will replace the audioButton occurrences as you wish:
for line in $(egrep "audioButton" swedish.txt | sed -e 's?\ ?::ZZqC::?g') ; do
real_line=$(echo "${line}" | sed -e 's?::ZZqC::?\ ?g') ;
new_line=$(echo "${real_line}" | sed -e 's?ä?ae?g' -e 's?ö?oe?g' -e 's?å?aa?g' -e 's?\([a-z]\) ?\1_?g') ;
sed -i -e "s|${real_line}|${new_line}|g" swedish.txt ;
done