Here’s a tip to explain how to use AutoCAD's match text formatting function, which is located on the contextual ribbon while in the MText editor command. (The button is also located on the MText editor dialog.) This tool applies the formatting of your selected text to characters within the same mtext object. This works great in instances where I copy text from one drawing to another that might have a slight difference in formatting.
First of all, you have to be in the MText editor; next, select the text that has the desired formatting, then click the Match button.
Notes from Cadalyst tip reviewer R.K. McSwain: Since mtext entities can contain many strings, each formatted differently, you can use Match Properties to work on smaller chunks of a large mtext object. In fact, when certain property overrides (such as font) have been applied to internal mtext strings, the global MatchProp command will not have any effect at all.