Regular Expressions 101

1st 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)

2nd Alternative(?<=[^A-Z])(?=[A-Z])

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

Negated Character Class[^A-Z]

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

Positive Lookahead(?=[A-Z])

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (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.

Search reference

Regular Expression

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

New

CostCenter
FYYear
ANotherTest
ANDAnotherTest
upperCase
UpperCase