Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:TCP|UDP)

1st AlternativeTCP

TCPthe literal text TCP (case sensitive)

2nd AlternativeUDP

UDPthe literal text UDP (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:-\d+)?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:,(?:TCP|UDP)\/\d+(?:-\d+)?)*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Non-Capturing Group(?:TCP|UDP)

1st AlternativeTCP

TCPthe literal text TCP (case sensitive)

2nd AlternativeUDP

UDPthe literal text UDP (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:-\d+)?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

$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.

26 tokens

^(?:TCP|UDP)\/\d+(?:-\d+)?(?:,(?:TCP|UDP)\/\d+(?:-\d+)?)*$

New

TCP/53,UDP/53,TCP/10-20,UDP/20-30

TCP/53UDP53,TCP/10-20UDP20-30

TCP/53,UDP/53,TCP/10-20,UDP/20-30

TCP/53UDP53,TCP/10-20UDP20-30