regex101: Validate Base64 with new lines (e.g. GPG base64 messages)

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

^start of string

Non-Capturing Group(?:[A-Za-z0-9+\/]{4}\n?)*

*repeats the group contents below any number of times:

Character Class[A-Za-z0-9+\/]{4}

{4}matches exactly 4 characters from the set below:

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)

\n?optionally matches a line-feed (newline) character (ASCII 10)

Non-Capturing Group(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)

1st Alternative[A-Za-z0-9+\/]{2}==

Character Class[A-Za-z0-9+\/]{2}

{2}matches exactly 2 characters from the set below:

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)

==the literal text ==

2nd Alternative[A-Za-z0-9+\/]{3}=

Character Class[A-Za-z0-9+\/]{3}

{3}matches exactly 3 characters from the set below:

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)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

$end of string, or before its final line terminator

Search reference

Regular Expression

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

New
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==

Regular Expressions 101

Regular Expression

Extraction