When using the $-sign notation, one other important thing to keep in mind is that you cannot have anything beside the variable name as the attribute value. So something like <mt:entries categories="$mycategory, Default, Sports"> is not possible.
Or is it?
What if you do this:
<mt:setvarblock name="morecategories"><mt:var name="mycategory">, Default, Sports</mt:setvarblock>
<mt:entries categories="$morecategories">
That actually works. And you can even apply this in combination with the regex_replace attribute:
<mt:entrybody regex_replace="/the\scategories\sof\sthis\sentry/gsi","$morecategories">
This will replace all instances of the phrase 'the categories of this entry" with the actual names of the categories (assuming they are in the $morecategories variable of course).
It even works the other way round: you could put the entire definition of the regular expression in a variable as well, and this allows you to put the contents of other variables or the output of template tags into the expression:
<mt:setvarblock name="expression">/<mt:entrycategory>/gsi</mt:setvarblock>
<mt:entrybody regex_replace="$expression","the category of this entry">
(Note: don't forget to make the slashes part of the variable content)
This should replace all instances of the name of the category of the entry with the string 'the category of this entry' (assuming the category name doesn't contain characters that break the regular expression syntax of course).
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Hey~! Thanks for the great tip. The documentation for regular expressions is quite poor in MT's site. Could you explain why the regex replace variable has to start with a "/" and end with a "/gsi" ?
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