Although you see a single option to set a ’Subject begins with’ match for incoming emails, you can in fact use that to match on any number of words or phrases. To do this, 2Do allows you to specify a Regex search pattern, which can be used to match on a combinations of different strings. When editing the Subject line, switch the Use as Regex Pattern option ON. Now, whatever you type into the subject field will be treated as a Regular Expression search string.

To learn more about Regex, please look at an online tutorial such as this. The following, for example, will match on any subject line that begins with either todo or fix: