regex101: PCRE2 (PHP) Match Workspace

Positive Lookahead(?=.*(?:^|[^0-9A-Za-z])(?:(?:25[0-5]|2[0-4]\d|1?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|1?\d?\d)(?=$|[^0-9A-Za-z]))

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

Non-Capturing Group(?:^|[^0-9A-Za-z])

1st Alternative^

^start of line

2nd Alternative[^0-9A-Za-z]

Negated Character Class[^0-9A-Za-z]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Non-Capturing Group(?:(?:25[0-5]|2[0-4]\d|1?\d?\d)\.){3}

{3}repeats the group contents below exactly 3 times:

Non-Capturing Group(?:25[0-5]|2[0-4]\d|1?\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 Alternative1?\d?\d

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d?optionally matches a digit

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:25[0-5]|2[0-4]\d|1?\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 Alternative1?\d?\d

1?optionally matches the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d?optionally matches a digit

\da digit

Positive Lookahead(?=$|[^0-9A-Za-z])

1st Alternative$

$end of line

2nd Alternative[^0-9A-Za-z]

Negated Character Class[^0-9A-Za-z]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

Non-Capturing Group(?:^|[^0-9A-Za-z])

1st Alternative^

^start of line

2nd Alternative[^0-9A-Za-z]

Negated Character Class[^0-9A-Za-z]

Group 1(\d{4}-(?:(?:01|03|05|07|08|10|12)-(?:0[1-9]|[12]\d|3[01])|(?:04|06|09|11)-(?:0[1-9]|[12]\d|30)|02-(?:0[1-9]|1\d|2[0-9])))

Positive Lookahead(?=$|[^0-9A-Za-z])

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

Search reference

Regular Expression

(?=.*(?:^|[^0-9A-Za-z])(?:(?:25[0-5]|2[0-4]\d|1?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|1?\d?\d)(?=$|[^0-9A-Za-z])).*(?:^|[^0-9A-Za-z])(\d{4}-(?:(?:01|03|05|07|08|10|12)-(?:0[1-9]|[12]\d|3[01])|(?:04|06|09|11)-(?:0[1-9]|[12]\d|30)|02-(?:0[1-9]|1\d|2[0-9])))(?=$|[^0-9A-Za-z])

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2025-01-09 User login from 02.01.01.01

Regular Expressions 101

Regular Expression

Extraction