regex101: Base64 Test

^start of string

Character Class[A-Z0-9\+\/]*

*matches any number of characters from the set below:

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

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

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

=?optionally matches the literal = (61₁₀ / 75₈ / 3D₁₆)

$end of string

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

26 tokens

Regular Expression

^[A-Z0-9\+\/]*=?$

New

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