macros:regular expression
Information on regular expressions can be found here: [1] Note that because this is Java, the regular expression are slightly different from regular 'regular expressions'. Here is a link where you can test your expression and it will change it to a java-type expression for you: [2]
Here is the java page that explains what the java regular expressions are. [3]
Note: the newline or (line-break) character is \\\n (three slashes). All the other characters like {space} require two slashes \\s