Email Validation inside EditText

Question

I want to validate an email introduced inside an EditText and this the code that I already have :

public static boolean isValidEmail(String str) { boolean isValid = false; String expression = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; CharSequence inputStr = str; Pattern pattern = Pattern.compile(expression); Matcher matcher = pattern.matcher(inputStr); if (matcher.matches()) { isValid = true; } return isValid; }

The problem is that when I am using _ and - these characters in starting of email id, no error is showing, but when i use any other character, an error is shown.

Now i want that when ever i used any special character in starting of email id, an error must be shown. no special character should be allowed in starting of email id.

what should i do for this..?

http://www.mkyong.com/regular-expressions/how-to-validate-email-address-with-regular-expression/ — S.Thiongane
– S.Thiongane, Commented Mar 31, 2014 at 7:47
@RethinavelPillai when i used [email protected] or [email protected], no error is shown. — Amardeepvijay
– Amardeepvijay, Commented Mar 31, 2014 at 7:50

Blackbelt · Accepted Answer · 2014-03-31 07:51:03Z

The pattern used to validate an email address in the android sdk is

 public static final Pattern EMAIL_ADDRESS = Pattern.compile( "[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}" + "\\@" + "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" + "(" + "\\." + "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" + ")+" );

you can access it this way:

 android.util.Patterns.EMAIL_ADDRESS

Amardeepvijay · Accepted Answer · 2014-03-31 07:52:49Z

1

try this simple code:

 public static boolean validateEmailAddress(String emailAddress) { regexPattern = Pattern .compile("^[(a-zA-Z-0-9-\\_\\+\\.)]+@[(a-z-A-z)]+\\.[(a-zA-z)]{2,3}$"); regMatcher = regexPattern.matcher(emailAddress); if (regMatcher.matches()) { return true; } else { return false; } }

edited Mar 31, 2014 at 7:52

Amardeepvijay

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answered Mar 31, 2014 at 7:50

Siruk Viktor

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4 Comments

Amardeepvijay Over a year ago

when i used %[email protected] email Id , its shown error but when i used [email protected] and [email protected], no error is shown.

Siruk Viktor Over a year ago

@Amardeep special symbol in the address - it's a bad idea that can lead to an error in the system e-mail. But if you really need, then you can define a list of available characters in any of the group - for example as follows: "^[(a-zA-Z-0-9-\\u0025\\_\\+\\.)]+@[(a-z-A-z)]+\\.[(a-zA-z)]{2,3}$"

Amardeepvijay Over a year ago

i dont want special character in email id. when i used any special character its shown error but when i used _ and - its accept. dont shown error msg

Siruk Viktor Over a year ago

@Amardeep ,because the characters _ and. are permitted for use in e-mail addresses. If you do so you must leave it in the group only characters that you allow: (a-zA-Z-0-9) etc.

Nasz Njoka Sr. · Accepted Answer · 2014-09-03 10:16:45Z

Simply you can create a method and check it before accepting the input . There's no need for manual check of the email input characters android has all these data types defined you just need to call it Example

public static boolean isEmailValid(CharSequence email) { return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches() ; }

Then on the oncreate or if within the button etc just call it like

 EditText et = (EditText)findViewbyid(R.id.email) ; String em = et.getText().toString() ; if(!Validating.isEmailValid(em)) { et.setHint("use this format [email protected]") ; return; }

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