base64 constant

Pattern const base64

Base64 String Regex Examples: SGVsbG8gd29ybGQ=, U29tZSBzdHJpbmc=

Implementation

static const Pattern base64 =
    r'^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$';