Regular Expressions 101

Group host(?P<host>\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

.any character (except for line terminators)

\d{1,3}a digit, repeated between 1 and 3 times

.any character (except for line terminators)

\d{1,3}a digit, repeated between 1 and 3 times

.any character (except for line terminators)

\d{1,3}a digit, repeated between 1 and 3 times

Group 2(\s-\s)

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

Group user_name(?P<user_name>[\w-]*)

Character Class[\w-]*

*matches any number of characters from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4(\s\[)

\sany whitespace character

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group time(?P<time>\w*\/\w*\/\d{1,4}:\d{1,2}:\d{1,2}:\d{1,2}\s-\d{1,4})

\w*any word character, repeated any number of times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\w*any word character, repeated any number of times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{1,4}a digit, repeated between 1 and 4 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{1,4}a digit, repeated between 1 and 4 times

Group 6(\]\s\")

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\sany whitespace character

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Group request(?P<request>.*)

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

Group 8(")

"the literal " (34₁₀ / 42₈ / 22₁₆)

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.

Search reference

Regular Expression

(?P<host>\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})(\s-\s)(?P<user_name>[\w-]*)(\s\[)(?P<time>\w*\/\w*\/\d{1,4}:\d{1,2}:\d{1,2}:\d{1,2}\s-\d{1,4})(\]\s\")(?P<request>.*)(")

Test String
New

146.204.224.152 - feest6811 [21/Jun/2019:15:45:24 -0700] "POST /incentivize HTTP/1.1" 302 4622

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
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