Regular Expressions 101

Pro

^start of string

Non-Capturing Group(?:\d{4}-\d{2}-\d{2}.*; ){0,1}

{0,1}repeats the group contents below at most once:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

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

; the literal text ;

Group 1(.*)

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

$end of string, or before its final line terminator

Ready to run

25 tokens

^(?:\d{4}-\d{2}-\d{2}.*; ){0,1}(.*)$