Regular Expressions 101

Explanation
Pro

\h*any horizontal whitespace character, repeated any number of times

Non-Capturing Group(?:(?:([a-z][A-Z]+))|(?:([A-Z])([A-Z]*)))

1st Alternative(?:([a-z][A-Z]+))

Non-Capturing Group(?:([a-z][A-Z]+))

Group 1([a-z][A-Z]+)

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Character Class[A-Z]+

+matches at least one character from the set below:

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

2nd Alternative(?:([A-Z])([A-Z]*))

Non-Capturing Group(?:([A-Z])([A-Z]*))

Group 2([A-Z])

Character Class[A-Z]

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

Group 3([A-Z]*)

Character Class[A-Z]*

*matches any number of characters from the set below:

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

Group 4(\h*)

\h*any horizontal whitespace character, 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

\h*(?:(?:([a-z][A-Z]+))|(?:([A-Z])([A-Z]*)))(\h*)

DIESE ZEILE wURDE mIT AUTOIT pROGRAMMIERT.

\L$1\U$2\L$3$4

DIESE ZEILE wURDE mIT AUTOIT pROGRAMMIERT.