Regular Expressions 101

^start of line

Negative Lookahead(?!.*\bjack\b.*\bjack\b)

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

\ban ASCII word boundary

jackthe literal text jack (case sensitive)

\ban ASCII word boundary

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

\ban ASCII word boundary

jackthe literal text jack (case sensitive)

\ban ASCII word boundary

Negative Lookahead(?!.*\bjames\b.*\bjames\b)

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

\ban ASCII word boundary

jamesthe literal text james (case sensitive)

\ban ASCII word boundary

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

\ban ASCII word boundary

jamesthe literal text james (case sensitive)

\ban ASCII word boundary

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

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

\ban ASCII word boundary

jamesthe literal text james (case sensitive)

\ban ASCII word boundary

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

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

\ban ASCII word boundary

jackthe literal text jack (case sensitive)

\ban ASCII word boundary

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

$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

^(?!.*\bjack\b.*\bjack\b)(?!.*\bjames\b.*\bjames\b)(?=.*\bjames\b)(?=.*\bjack\b).*$

New

hi jack here is james
hi james here is jack
hi james jack here is jack james
hi jack james here is james jack
hi jack jack here is jack james
hi james james here is james jack
hi jack jack jack here is james