Help using regex to remove text

Some characters are not represented literarily in HTML text, have to be replaced with special encoding. For example < must be represented by &lt;
 
Double-tap a sentence on @Voice main screen which contains the text you want to replace. Then go to Settings - Edit speech - add a new replacement and look at the sample text below the "TEST:" button. Instead of:
 
s://t <<
 
you will see:
 
s://t &lt;&lt;
 
and so on.