CODEWITHSUNDEEP
flutterdart
Manas Maji
Manas Maji

Reputation: 31

How to restrict flutter Textfield or TextFormField to accept only english language?

How to restrict flutter Textfield or TextFormField to accept only english language ?? No other language should be allowed to enter.

Upvotes: 3

Views: 7302

Answers (3)

Masum Billah Sanjid
Masum Billah Sanjid

Reputation: 1189

Try with this

TextField(
  inputFormatters: [
            FilteringTextInputFormatter.allow(RegExp("^[\u0000-\u007F]+\$"))
    ])

Or you can try with this if you want only english character.

 TextField(
   inputFormatters: [
            FilteringTextInputFormatter.allow(RegExp("[a-zA-Z]"))
       ])

Upvotes: 8

Mudasir Syed
Mudasir Syed

Reputation: 131

You can use regular expressions of english

bool validEnglish(String value) { 
  RegExp regex = RegExp(r'/^[A-Za-z0-9]*$'); 
  return (!regex.hasMatch(value)) ? false : true; 
}

TextFormField(
              decoration: InputDecoration(
                hintText: 'Enter text',
              ),
              textAlign: TextAlign.center,
               validator: (text) {
                if (text == null || text.isEmpty || !validEnglish(text)) {
                  return 'Text is empty or invalid' ;
                }
                return null;
              },
            )

Upvotes: 1

Amroun
Amroun

Reputation: 455

TextField(
    inputFormatters: <TextInputFormatter>[
       FilteringTextInputFormatter.allow(RegExp('[a-z A-Z 0-9]'))
    ],
)

Upvotes: 3

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