Changing the charset for double click highlight in Mousepad editor

Can I modify the character set which is used to recognize a single word for the double click word highlight in Mousepad , the default text editor in Debian xfce4? Eg. I would like to highlight words separated by m letter and the space. Then in the word memory two words would be highligted e and ory. When one double-clicks on e, e will be highlighted, and when one double-clicks ory, ory will be higligted. I mean a way to change the charset that defines separators when one double-clicks words in the editor.