Regular Expressions 101

^start of line

Group 1((?&byte))

(?&byte)calls group byte as a subroutine

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2((?&byte))

(?&byte)calls group byte as a subroutine

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3((?&byte))

(?&byte)calls group byte as a subroutine

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4((?&byte))

(?&byte)calls group byte as a subroutine

$end of line

Definition Group(?(DEFINE)(?<byte>25[0-5]|2[0-4]\d|[01]?\d\d?))

Group byte(?<byte>25[0-5]|2[0-4]\d|[01]?\d\d?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative2[0-4]\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

\da digit

3rd Alternative[01]?\d\d?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

\d?optionally matches a digit

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

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25 tokens

Regular Expression

^((?&byte))\.((?&byte))\.((?&byte))\.((?&byte))$(?(DEFINE)(?<byte>25[0-5]|2[0-4]\d|[01]?\d\d?))

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