Regular Expressions 101

Explanation

Pro

Negative Lookbehind(?<!^)

^start of line

Positive Lookahead(?=(?<![.\-'"([{])(?<![A-Z])[A-Z][\d+?]?)

Negative Lookbehind(?<![.\-'"([{])

Character Class[.\-'"([{]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Negative Lookbehind(?<![A-Z])

Character Class[A-Z]

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

Character Class[A-Z]

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

Character Class[\d+?]?

?matches at most one character from the set below:

\da digit

+the literal + (43₁₀ / 53₈ / 2B₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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])[A-Z][\d+?]?)

New

ThisIsAnExampleTitleHELLO-WORLD2019T.E.S.T.(Test)[Test]"Test"'Test'