Regular Expressions 101

^start of string

Negative Lookahead(?!Andrea)

Andreathe literal text Andrea (case sensitive)

Non-Capturing Group(?:[\S\s](?!Andrea))*+

*+repeats the group contents below any number of times:

Character Class[\S\s]

\Sany non-whitespace character

\sany whitespace character

Negative Lookahead(?!Andrea)

Andreathe literal text Andrea (case sensitive)

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?!Andrea)(?:[\S\s](?!Andrea))*+$

New

Example for Stack Overflow:
http://stackoverflow.com/questions/164414/how-to-inverse-match-with-regex
http://stackoverflow.com/a/38846455/1188377

This test string is NOT a match because it contains the text "Andrea".  If it didn't contain that word, it would be a match.

For a variety of test cases, click the "Unit Tests" button on the left side of the page.  It looks like a checkmark.  Then, click the "play" icon above the test list.