Regular Expressions 101

\ba Unicode word boundary

Negative Lookahead(?!Foo\b|bar\b)

1st AlternativeFoo\b

Foothe literal text Foo (case sensitive)

\ba Unicode word boundary

2nd Alternativebar\b

barthe literal text bar (case sensitive)

\ba Unicode word boundary

Character Class[A-Za-z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

\b(?!Foo\b|bar\b)[A-Za-z]+

New

Hey, Foo, we can meet at the bar.
Hey, Foobar, we can meet at the bar.