Added 4 useful methods
/** * Returns the domain part of a given Email address * * @param email The Email address. E.g Returns "protonmail.com" from the given Email "johnsmith@protonmail.com". * @return the domain part of a given Email address. */ public static String extractEmailProvider(String email) { return email.substring(email.lastIndexOf("@") + 1); } /** * Returns the username part of a given Email address. E.g. Returns "johnsmith" from the given Email "johnsmith@protonmail.com". * * @param email The Email address. * @return the username part of a given Email address. */ public static String extractEmailUsername(String email) { return email.substring(0, email.lastIndexOf("@")); } /** * Return whether a given Email address is on a specified Email provider. E.g. "johnsmith@protonmail.com" and "gmail.com" will return false. * * @param email The Email address. * @param emailProvider The Email provider to testify against. * @return {@code true}: yes<br>{@code false}: no */ public static boolean isFromEmailProvider(String email, String emailProvider) { return extractEmailProvider(email).equalsIgnoreCase(emailProvider); } /** * Return whether a given Email address is on any of the specified Email providers list (array). E.g. Useful if you pass it a list of real Email provider services and check if the Email is a disposable Email or a real one. * * @param email The Email address. * @param emailProviders The list of Email providers to testify against. * @return {@code true}: yes<br>{@code false}: no */ public static boolean isFromAnyOfEmailProviders(String email, String[] emailProviders) { return com.blankj.utilcode.util.ArrayUtils.contains(emailProviders, extractEmailProvider(email)); }
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