Regular Expressions 101

Explanation

Pro

^start of string

Group 1([[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\s)

Character Class[[:digit:]]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

[:digit:]a digit [0-9]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[[:digit:]]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

[:digit:]a digit [0-9]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[[:digit:]]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

[:digit:]a digit [0-9]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[[:digit:]]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

[:digit:]a digit [0-9]

\sany whitespace character

Group 2([a-zA-Z0-9_.\[\]\(\)\-:\s]{1,})

Character Class[a-zA-Z0-9_.\[\]\(\)\-:\s]{1,}

{1,}matches at least one character from the set below:

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

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

\sany whitespace character

Group 3(ModSecurity:\sWarning.\s)

ModSecurity:the literal text ModSecurity: (case sensitive)

\sany whitespace character

Warningthe literal text Warning (case sensitive)

.any character (except for line terminators)

\sany whitespace character

Group 4([a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,})

Character Class[a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,}

{1,}matches at least one character from the set below:

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

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

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

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

Group 5(\s\[severity "CRITICAL"\]\s)

\sany whitespace character

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

severity "CRITICAL"the literal text severity "CRITICAL" (case sensitive)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\sany whitespace character

Group 6([a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,})

Character Class[a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,}

{1,}matches at least one character from the set below:

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

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

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

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

\sany whitespace character

Group 7("OWASP_CRS\/)

"OWASP_CRSthe literal text "OWASP_CRS (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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Quick Reference

25 tokens

Regular Expression

^([[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\s)([a-zA-Z0-9_.\[\]\(\)\-:\s]{1,})\s(ModSecurity:\sWarning.\s)([a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,})(\s\[severity "CRITICAL"\]\s)([a-zA-Z0-9\"\/\_\.\[\]\(\)\-:\s]{1,})\s("OWASP_CRS\/)

Unit Tests

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