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November 23, 2022

RegEx to parse or validate Base64 data - Stack Overflow

base64 RegEx

php - RegEx for detecting base64 encoded strings - Stack Overflow

^@(?=(.{4})$)[A-Za-z0-9+/]={0,2}$

base64 RegEx

Note: base64 regex

if (paddingRequired) {
regex = /^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/;
}
else {
regex = /^(?:[A-Za-z0-9+\/]){2,}(={0,2})$/;
}

base64 RegEx