I want to decode a Base64 encoded string, then store it in my database. If the input is not Base64 encoded, I need to throw an error.
How can I check if a string is Base64 encoded?
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I want to decode a Base64 encoded string, then store it in my database. If the input is not Base64 encoded, I need to throw an error.
How can I check if a string is Base64 encoded?
You can use the following regular expression to check if a string constitutes a valid base64 encoding:
In base64 encoding, the character set is
[A-Z, a-z, 0-9, and + /]. If the rest length is less than 4, the string is padded with'='characters.^([A-Za-z0-9+/]{4})*means the string starts with 0 or more base64 groups.([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$means the string ends in one of three forms:[A-Za-z0-9+/]{4},[A-Za-z0-9+/]{3}=or[A-Za-z0-9+/]{2}==.