Regular Expressions 101

Pro

1st Alternative^(.)\1(?!\1)

^start of line

Group 1(.)

.any character (except for line terminators)

\1the text saved by group 1

Negative Lookahead(?!\1)

\1the text saved by group 1

2nd Alternative(.?)(?!\2)(.)\3(?!\3)

Group 2(.?)

.?optionally matches any character (except for line terminators)

Negative Lookahead(?!\2)

\2the text saved by group 2

Group 3(.)

.any character (except for line terminators)

\3the text saved by group 3

Negative Lookahead(?!\3)

\3the text saved by group 3

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.

27 tokens

^(.)\1(?!\1)|(.?)(?!\2)(.)\3(?!\3)

New

Helo -> false
programming -> true
belllike -> false
shellless -> true
hhey
arhh

Helo -> false
programming -> true
belllike -> false
shellless -> true
hhey
arhh