How to Check if String contains only Numeric Digits in Dart - Step by Step Examples

How to Check if String contains only Numeric Digits in Dart ?

Answer

To check if a string contains only numeric digits in Dart, you can use regular expressions or iterate through each character in the string and check if it is a digit using 'isDigit' property.

✐ Examples

1 Check if String contains only Numeric Digits using regular expressions

In this example,

We create a function 'containsOnlyNumericDigits' that takes a string as input.
We use a regular expression pattern '\d+' to match only numeric digits in the string.
If the entire string matches the pattern, 'true' is returned; otherwise, 'false'.
Finally, we print the result.

Dart Program

bool containsOnlyNumericDigits(String str) {
  return RegExp(r'\d+').hasMatch(str);
}

void main() {
  String str = '12345';
  bool allDigits = containsOnlyNumericDigits(str);
  print('String contains only numeric digits: \$allDigits');
}

Output

String contains only numeric digits: true

2 Check if String contains only Numeric Digits using character iteration

In this example,

We create a function 'containsOnlyNumericDigits' that takes a string as input.
We iterate through each character in the string and check if it is a digit using 'isDigit' property.
If all characters are numeric digits, 'true' is returned; otherwise, 'false'.
Finally, we print the result.

Dart Program

bool containsOnlyNumericDigits(String str) {
  for (var char in str.runes) {
    if (!isDigit(char)) {
      return false;
    }
  }
  return true;
}

void main() {
  String str = '12345';
  bool allDigits = containsOnlyNumericDigits(str);
  print('String contains only numeric digits: \$allDigits');
}

Output

String contains only numeric digits: true

Summary

In this tutorial, we learned How to Check if String contains only Numeric Digits in Dart language with well detailed examples.

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How to Check if String contains only Numeric Digits in Dart - Step by Step Examples

How to Check if String contains only Numeric Digits in Dart ?

Answer

✐ Examples

1 Check if String contains only Numeric Digits using regular expressions

Dart Program

Output

2 Check if String contains only Numeric Digits using character iteration

Dart Program

Output

Summary

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