Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!(?:§|[A-Z]+$))

Non-Capturing Group(?:§|[A-Z]+$)

1st Alternative§

§the literal § (167₁₀ / 247₈ / A7₁₆)

2nd Alternative[A-Z]+$

Character Class[A-Z]+

+matches at least one character from the set below:

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

$end of line

.{0,3}any Unicode character (except for line terminators), repeated between 0 and 3 times

Non-Capturing Group(?:[\r\n]+|\z)

1st Alternative[\r\n]+

Character Class[\r\n]+

+matches at least one character from the set below:

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

2nd Alternative\z

\zend of string

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

^(?!(?:§|[A-Z]+$)).{0,3}(?:[\r\n]+|\z)

New

§day
DOG
Happy
Monday
Now
Yes
Sunday
§new day.txt
DIY
Leg
Books
Car
Home
abc

§day
DOG
Happy
Monday
Now
Yes
Sunday
§new day.txt
DIY
Leg
Books
Car
Home
abc