Regular Expressions 101

Pro

1st Alternative(?<=[a-z\d])(?=[A-Z])

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

Character Class[a-z\d]

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

\da digit

Positive Lookahead(?=[A-Z])

Character Class[A-Z]

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

2nd Alternative(?<=[A-Z])(?=[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][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 (97₁₀) to z (122₁₀) (case sensitive)

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.

26 tokens

(?<=[a-z\d])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])

New

camelCase
simple
number1Case2

ABCWordDEF
abcDeF123

camelCase
simple
number1Case2

ABCWordDEF
abcDeF123