Regular Expressions 101

Positive Lookbehind(?<=[( ])

Character Class[( ]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\d{4}a digit, repeated exactly 4 times

Positive Lookahead(?=\S*\)|$)

1st Alternative\S*\)

\S*any non-whitespace character, repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative$

$end of line

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

(?<=[( ])\d{4}(?=\S*\)|$)

New

Grumpier Old Men (1995)
Death Note: Desu nÃ´to (2006â€“2007)
Irwin & Fran 2013
9500 Liberty (2009)
Captive Women (1000 Years from Now) (3000 A.D.) (1952)
The Garden of Afflictions 2017
The Naked Truth (1957) (Your Past Is Showing)

Regular Expression

Substitution