DLP uses the Java RegEx engine. Check the Java reference pages for information.
I'd also suggest the "Mastering Regular Expression" book from O'Reilly.
Do you understand what the prefix and suffix patterns are looking for? If not, go to the above resources.
Are they appropriate for your data? You may not need the features of the "default" boundary expressions. You can adjust those expressions to better match your data.
Is there a Data Identifier to cover what you are looking for? If so, use it as it is much more efficient than a RegEx and does a lot more validation.
Why the eye towards performance?
JGT