Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:AB(?!C)|(?!.*DEF).*DE)

1st AlternativeAB(?!C)

ABthe literal text AB (case sensitive)

Negative Lookahead(?!C)

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

2nd Alternative(?!.*DEF).*DE

Negative Lookahead(?!.*DEF)

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

DEFthe literal text DEF (case sensitive)

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

DEthe literal text DE (case sensitive)

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

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.

25 tokens

^(?:AB(?!C)|(?!.*DEF).*DE).*

New

AB3
ABC
sDEN23
DET
DE
DEF
DEh
DEK
xxxDEFxxDExx

AB3
ABC
sDEN23
DET
DE
DEF
DEh
DEK
xxxDEFxxDExx