valid_regexps

Invalid regular expression syntax.

The analyzer produces this diagnostic when the string passed to the default constructor of the class RegExp doesn't contain a valid regular expression.

A regular expression created with invalid syntax will throw a FormatException at runtime.

The following code produces this diagnostic because the regular expression isn't valid:

var r = RegExp(r'(');

Fix the regular expression:

var r = RegExp(r'\(');

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