Regular Expressions 101

Pro

Negative Lookahead(?!^)

^start of line

\s+a Unicode whitespace character, repeated at least once

Positive Lookahead(?=[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)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

(?!^)\s+(?=[A-Z]+:)

Test1 AA:Hello AB:1234 AC:1F 322 AD:hj21jkhjk23
Billy Bob Thorton AA:213231 AB:aaaa AC:ddddd 322 AD:hj2ffs   dsfdsfd1jkhjk23

Test1 AA:Hello AB:1234 AC:1F 322 AD:hj21jkhjk23
Billy Bob Thorton AA:213231 AB:aaaa AC:ddddd 322 AD:hj2ffs   dsfdsfd1jkhjk23