We use the encoding/base64 package to do this, which takes in and returns a byte array into it’s EncodeToString and DecodeString methods. Doing this has many uses, one of which to safely encode byte data in structures like JSON. The example below shows to how to encode and then subsequently decode a string using base 64. There are also some middle grounds available in between, like checking the top level domain has a valid MX record and detecting temporary email addresses (if these aren’t wanted). The solutions range from nice’n’quick, by using regex to check the email address is formatted correctly - through to complicated, by actually trying to interface with the remote server. See the starting character.Validating email addresses, like many thing, are one of those things you can put any amount of effort you want into. You could also supply a length range instead of the one or more matcher, if that were more appropriate. Create a regular expression that accepts alphanumeric characters only. This is typical, but if you wanted allow underscores, that could be addressed as well. Java Regex tutorial - Regular Expression in java with examples, api, matcher. The extension must be at least one character long and must contain only letters and numbers. If you want more than one extension that could be handled as well using the same technique as for the dash/underscore, just at the end. Forces the file name to have an extension and, by exclusion from the rest of the pattern, only allow the period to be used between the name and the extension. This covers all names that do not contain an underscore or a dash. regex101: Alphanumeric Regex Explanation / (.a-zA-Z) (.0-9)a-zA-Z0- 9 / asserts position at start of the string Positive Lookahead (.a-zA-Z) Assert that the Regex below matches. This causes all names that contain a dash or underscore to have letters or numbers between them.
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