Regular Expressions 101

Positive Lookahead(?=.*\bfoo\b)

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

\ban ASCII word boundary

foothe literal text foo (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bbar\b)

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

\ban ASCII word boundary

barthe literal text bar (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bfoobar\b)

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

\ban ASCII word boundary

foobarthe literal text foobar (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bfootable\b)

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

\ban ASCII word boundary

footablethe literal text footable (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*\bsomebar\b)

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

\ban ASCII word boundary

somebarthe literal text somebar (case sensitive)

\ban ASCII word boundary

^start of line

Non-Capturing Group(?:\w+\s+){4}

{4}repeats the group contents below exactly 4 times:

\w+any word character, repeated at least once

\s+any whitespace character, repeated at least once

\w+any word character, repeated at least once

$end of line

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

(?=.*\bfoo\b)(?=.*\bbar\b)(?=.*\bfoobar\b)(?=.*\bfootable\b)(?=.*\bsomebar\b)^(?:\w+\s+){4}\w+$

New

foo bar foobar footable somebar
foo bar footable somebar
foobar foo bar footable somebar
foo bar foobar footable somebar footable
foobar foo bar xyz somebar

Regular Expression

Substitution