Regular Expressions 101

^start of line

Negative Lookahead(?!.*\bqwe\s+abc\b)

.*any Unicode character (except for line terminators), repeated any number of times

\ba Unicode word boundary

qwethe literal text qwe (case sensitive)

\s+a Unicode whitespace character, repeated at least once

abcthe literal text abc (case sensitive)

\ba Unicode word boundary

.*any Unicode character (except for line terminators), repeated any number of times

\ba Unicode word boundary

abcthe literal text abc (case sensitive)

\ba Unicode word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?!.*\bqwe\s+abc\b).*\babc\b

New

qwe  abc
qwe abc
abc