extra (more than 1) spaces are automatically truncated
all static HTML documents are scanned including HTML tags
you can use regular expressions, e.g.
'.*' will substitute any string (like '*' in most file systems) (e.g. United.*America covers 'United States of America')
'[0-9]*' will substitute any number
'[a-z]*' will substitute any single word
'.' will substitute any single char
Notice: search scope is usually one line, thus pattern 'word1.*word2' won't
probably find couple word1, word2 if they are too far each other in the document.