Several comma-separated tags will be considered as logical AND between them. You can also use semicolon for logical OR. AND has a priority over OR and you cannot use parentheses for logical grouping. Asterisk (*) within a tag will be regarded as a mask for "any string".
Using HTML parser with elRTE / elFinder is cool. BBCodes, however, remain simple yet powerful tool that can be used not only to maintain full control over the text markup. It enables an easy way to embed pictures into the page main text (PAGE_TEXT). This is how you do it: