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<?php function is_base64($s) { return (bool) preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $s); } var_dump(is_base64("dfdf")); var_dump(is_base64("CkRldmljZSBOYW1lIC0gTW9kZWw6IDx1bmtub3duPiAtIEhVQVdFSSBIVUFXRUkgWTMwMC0wMTAwCk9wZXJhdGluZyBTeXN0ZW06IEFuZHJvaWQgT1MgNC4xLjEgLyBBUEktMTYgKEh1YXdlaVkzMDAtMDEwMC9DNDc5QjE5Nyk="));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true)

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