regex101: PCRE (Legacy) Substitution Workspace

^start of line

Group 1(((\r?\n|\s)*[A-Za-z0-9+\/]){4})*

*repeats the group contents below any number of times:

Group 2((\r?\n|\s)*[A-Za-z0-9+\/]){4}

{4}repeats the group contents below exactly 4 times:

Group 3(\r?\n|\s)*

*repeats the group contents below any number of times:

1st Alternative\r?\n

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

2nd Alternative\s

\sany whitespace character

Character Class[A-Za-z0-9+\/]

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

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

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

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 4(((\r?\n|\s)*[A-Za-z0-9+\/]){2}(=(\r?\n|\s)*){2}|((\r?\n|\s)*[A-Za-z0-9+\/]){3}(=(\r?\n|\s)*))?

?repeats the group contents below at most once:

1st Alternative((\r?\n|\s)*[A-Za-z0-9+\/]){2}(=(\r?\n|\s)*){2}

Group 5((\r?\n|\s)*[A-Za-z0-9+\/]){2}

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

Group 6(\r?\n|\s)*

*repeats the group contents below any number of times:

1st Alternative\r?\n

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

2nd Alternative\s

\sany whitespace character

Character Class[A-Za-z0-9+\/]

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

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

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

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 7(=(\r?\n|\s)*){2}

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

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 8(\r?\n|\s)*

*repeats the group contents below any number of times:

1st Alternative\r?\n

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

2nd Alternative\s

\sany whitespace character

2nd Alternative((\r?\n|\s)*[A-Za-z0-9+\/]){3}(=(\r?\n|\s)*)

Group 9((\r?\n|\s)*[A-Za-z0-9+\/]){3}

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

Group 10(\r?\n|\s)*

*repeats the group contents below any number of times:

1st Alternative\r?\n

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

2nd Alternative\s

\sany whitespace character

Character Class[A-Za-z0-9+\/]

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

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

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

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 11(=(\r?\n|\s)*)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 12(\r?\n|\s)*

*repeats the group contents below any number of times:

1st Alternative\r?\n

2nd Alternative\s

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Search reference

Regular Expression

^(((\r?\n|\s)*[A-Za-z0-9+\/]){4})*(((\r?\n|\s)*[A-Za-z0-9+\/]){2}(=(\r?\n|\s)*){2}|((\r?\n|\s)*[A-Za-z0-9+\/]){3}(=(\r?\n|\s)*))?$

New


	This is a good test 
to check for base64 encoded 
strings because it forces 
the string to begin and end 
in its own line==
Arriba Cachipurriana
00000000: 4e 18 ac 8a c6 a0 a2 87 6d 7a cb 6d a1 c8 5e 72 :N.......mz.m..^r
00000010: 47 e8 ad b6 ac 7b ae 1e 9d ca 1d 79 db 2d ae 29 :G....{.....y.-.)
00000020: e0 b1 b7 9c 6a eb 1e 8a d7 e8 ad c7 ac b6 17 ac :....j...........
00000030: b6 b8 a7 82 da 1b 7a 08 a7 6a 77 5e 9d d8 a7 8a :......z..jw^....
00000040: db 28 c2 79 62 9d                               :.(.yb.
00000046.
--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Regular Expressions 101

Regular Expression

Extraction