Regular Expressions 101

Group CCT(?<CCT>(?:(?<=[A-Z])(?=[^A-Z]))|(?:(?<=[a-z])(?=[^a-z]))|(?:(?<=\d)(?=\D))|(?:(?<=[^A-Za-z\d])(?=[A-Za-z\d])))

1st Alternative(?:(?<=[A-Z])(?=[^A-Z]))

Non-Capturing Group(?:(?<=[A-Z])(?=[^A-Z]))

Positive Lookbehind(?<=[A-Z])

Character Class[A-Z]

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

Positive Lookahead(?=[^A-Z])

Negated Character Class[^A-Z]

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

2nd Alternative(?:(?<=[a-z])(?=[^a-z]))

Non-Capturing Group(?:(?<=[a-z])(?=[^a-z]))

Positive Lookbehind(?<=[a-z])

Character Class[a-z]

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

Positive Lookahead(?=[^a-z])

Negated Character Class[^a-z]

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

3rd Alternative(?:(?<=\d)(?=\D))

Non-Capturing Group(?:(?<=\d)(?=\D))

Positive Lookbehind(?<=\d)

\da digit

Positive Lookahead(?=\D)

\Dany character that's not a digit

4th Alternative(?:(?<=[^A-Za-z\d])(?=[A-Za-z\d]))

Non-Capturing Group(?:(?<=[^A-Za-z\d])(?=[A-Za-z\d]))

Positive Lookbehind(?<=[^A-Za-z\d])

Negated Character Class[^A-Za-z\d]

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

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

\da digit

Positive Lookahead(?=[A-Za-z\d])

Character Class[A-Za-z\d]

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

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

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<CCT>(?:(?<=[A-Z])(?=[^A-Z]))|(?:(?<=[a-z])(?=[^a-z]))|(?:(?<=\d)(?=\D))|(?:(?<=[^A-Za-z\d])(?=[A-Za-z\d])))

New

this regex matches all transitions. 1nur15itmightb3interest1ng