regex101: PCRE2 (PHP) Match Workspace

Pro

^start of line

Non-Capturing Group(?: (?:[1-9]\d?|1\d{2}|2[01]\d|22[0-3])\. # a group, 1-223 with "." (?:(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])\.){2} # b and c groups 0-255 with "." (?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5]) # d group, ends with optional netmask instead of "." (?:\/(?:[89]|[12]\d|3[0-2]))? # netmask ,?\h? # allow comma separated, optional space between ){1,50}

{1,50}repeats the group contents below between 1 and 50 times:

Non-Capturing Group(?:[1-9]\d?|1\d{2}|2[01]\d|22[0-3])

1st Alternative[1-9]\d?

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d?optionally matches a digit

2nd Alternative1\d{2}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

3rd Alternative2[01]\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

4th Alternative22[0-3]

22the literal text 22

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Comment: a group, 1-223 with "."

Non-Capturing Group(?:(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])\.){2}

{2}repeats the group contents below exactly 2 times:

Non-Capturing Group(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])

1st Alternative[1-9]?\d

Character Class[1-9]?

?matches at most one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\da digit

2nd Alternative1\d{2}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

3rd 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

4th Alternative25[0-5]

25the literal text 25

Character Class[0-5]

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Comment: b and c groups 0-255 with "."

Non-Capturing Group(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])

1st Alternative[1-9]?\d

Character Class[1-9]?

?matches at most one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\da digit

2nd Alternative1\d{2}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

3rd 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

4th Alternative25[0-5]

25the literal text 25

Character Class[0-5]

Comment: d group, ends with optional netmask instead of "."

Non-Capturing Group(?:\/(?:[89]|[12]\d|3[0-2]))?

Comment: netmask

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

\h?optionally matches any horizontal whitespace character

Comment: allow comma separated, optional space between

$end of line

Comment: up to 50 IPs

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

25 tokens

Regular Expression

^(?:
   (?:[1-9]\d?|1\d{2}|2[01]\d|22[0-3])\.         # a group, 1-223 with "."
   (?:(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])\.){2} # b and c groups 0-255 with "."
   (?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])          # d group, ends with optional netmask instead of "."
   (?:\/(?:[89]|[12]\d|3[0-2]))?                 # netmask
   ,?\h?                                         # allow comma separated, optional space between
){1,50}$                                         # up to 50 IPs

New

1.1.1.
1.1.1.2
1.1.1.2/23
1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23

Extraction

1.1.1.
1.1.1.2
1.1.1.2/23
1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23,1.1.1.2/23