Question 76132 in Flutter Question posted in
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Flutter | TextField – How to create RegExp for valid double?

FilteringTextInputFormatter – How to create RegExp to prevent the user from typing more than one period, from typing a comma, from typing numbers after zero except period, etc.

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2

Answers


  1. 0

    try this:

    TextField(
                      decoration: InputDecoration(
                        labelText: 'Enter a number:',
                      ),
                      keyboardType:
                          TextInputType.numberWithOptions(decimal: true),
                      inputFormatters: [
                        FilteringTextInputFormatter(
                            RegExp(r'^d*.?d{0,1}$'),
                            allow: true),
                      ],
                    ),
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  2. 0

    Resolved.

    List<TextInputFormatter>? inputFormatters = [
  FilteringTextInputFormatter.allow(
    RegExp(r'(^d*.?d*)'),
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'..+'), 
    replacementString: '.',
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'^.'), 
    replacementString: '0.',
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'd+-'), 
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'.-'),
    replacementString: '.',
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'-.+'),
  ),

  FilteringTextInputFormatter.deny(
    RegExp(r'^0d+'),
    replacementString: '0.',
  ),
];
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