regex101: JavaScript Match Workspace

Pro

Positive Lookbehind(?<=Country.{1,30}\()

Countrythe literal text Country (case sensitive)

.{1,30}any character (except for line terminators), repeated between 1 and 30 times

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.*any character (except for line terminators), repeated any number of times

Positive Lookahead(?=\))

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

26 tokens

Regular Expression

(?<=Country.{1,30}\().*(?=\))

New

Country: Pakistan (PK)
Country: Россия-матушка (RM)
Country: Заграничье бусурманское (ZB)

untry: Pakistan (PK)
Coutry: Россия-матушка (RM)
Country: Заграничье бусурманское (ZB)

Coutry: Россия-матушка (RM)
Country: Заанское (ZB)

Substitution

Country: Pakistan (PK)
Country: Россия-матушка (RM)
Country: Заграничье бусурманское (ZB)

untry: Pakistan (PK)
Coutry: Россия-матушка (RM)
Country: Заграничье бусурманское (ZB)

Coutry: Россия-матушка (RM)
Country: Заанское (ZB)