2.90:Tab Marking (Property)

Tab Marking allows you to insert tab characters into a document's text data.
The Tab Marking property enables tab characters for regular expression pattern matching. These characters are inserted into a document's text data wherever there is a large gap of space between characters on a line.
About
Normally, a space is a space is a space. Whether a space between characters, a space between columns, or any other space between characters, those spaces are represented by a single space character in a document's text data.