CODEWITHSUNDEEP
regexdart
S.D.
S.D.

Reputation: 5857

Matching $ (dollar sign) words in Dart regular expression

I want to match all dollar sign words in the text. For example, "Hello $VARONE this is $VARTWO", would match $VARONE and $VARTWO.

The regex should be /\$(\w+)/g but when I use this in Dart with the compiler in DartPad (https://dartpad.dartlang.org/) the words are not matched.

void main() {
  final variableGroupRegex = new RegExp(r"/\$(\w+)/g");

  Iterable<Match> matches = variableGroupRegex.allMatches("Hello \$VARONE this is \$VARTWO");
    for (Match match in matches) {
         print("match $match"); // code is never run as no matches
    }
}

Upvotes: 1

Views: 1501

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626738

You may fix it as

final variableGroupRegex = new RegExp(r"\$(\w+)");

Iterable<Match> matches = variableGroupRegex.allMatches("Hello \$VARONE this is \$VARTWO");
for (Match match in matches) {
     print(match.group(0));
     print(match.group(1));
}

Output:

$VARONE
VARONE
$VARTWO
VARTWO

Here, you define the regex with a raw string literal, and r"\$(\w+) defines the \$(\w+) pattern. Then, to access the whole match, you may use .group(0) and to grab the captured value, use .group(1).

Upvotes: 3

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