match specific string in Dart Language with Regex

Question

I am looking Regex formula for Dart, to check either the input is matching specific any string or not which I proved. Example: input is 'butter', and proved strings are ['but','burst','bus']. The program should return false because 'but' is not equal to the 'butter'. But it is returning true as below code.

void main() {
  const string = 'Can you give me a butter';
  const pattern = r'(but)|(burst)|(bus)';
  final regExp = RegExp(pattern);
  print(regExp.hasMatch(string.toLowerCase())); //true
}

You don't need to add `$` for each possibility. Group them and add `$` at the end: `(but|burst|bus)$` — Abd Elbeltaji, Aug 13 '21 at 08:02
Dart uses the same regular expression syntax as JavaScript. There's no reason why you can't use `$` in the Dart regular expression pattern as long as you use raw strings (prefixed with `r`), which you're already doing. — jamesdlin, Aug 13 '21 at 08:05
But, a little looks different because it is not working like that ``const pattern = r'(but)$|(burst)$|(bus)$';`` But in Js it is working like that ``let testRegex=/(but)$|(burst)$|(bus)$/i`` — Cihat Şaman, Aug 13 '21 at 08:09
BTW, `$` refers to `end of line` if you are expecting the word to be anywhere use `\b`: `\b(but|burst|bus)\b` — Abd Elbeltaji, Aug 13 '21 at 08:10
@AbdElbeltaji I am looking at that actually but I couldn't it. ``/\b: \b(butter|burst|bus)\b/i`` I did like that but it is returns false . — Cihat Şaman, Aug 13 '21 at 09:00

score 2 · Accepted Answer · edited Aug 13 '21 at 14:03

2

When I changed the codes as below it worked well.

void main() {
  const string = 'Can you give me a But asasa';
  const pattern = r'\b(but|burst|bus)\b';
  final regExp = RegExp(pattern, caseSensitive: false);
  print(regExp.hasMatch(string)); 
}

edited Aug 13 '21 at 14:03

lrn

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answered Aug 13 '21 at 08:14

Cihat Şaman

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match specific string in Dart Language with Regex

1 Answers1