DartVerbalExpressions

verbal_expressions

A library for Dart developers that helps to construct difficult regular expressions.

Dart package info is here: https://pub.dartlang.org/packages/verbal_expressions

Quick start

  var regex = VerbalExpression()
   ..startOfLine()
   ..then("http").maybe("s")
   ..then("://")
   ..maybe("www.").anythingBut(" ")
   ..endOfLine();

  // Create an example URL
  String url = "https://www.google.com";

  // Use VerbalExpression's hasMatch() method to test if the entire string matches the regex
  regex.hasMatch(url); //True

  regex.toString();   // Outputs the regex used: ^http(s)?\\:\\/\\/(www\\.)?([^\\ ]*)\$

  var regex = VerbalExpression()..startOfLine()..then("abc")..or("def");

  var testString = "defzzz";
  //Use VerbalExpression's hasMatch() method to test if parts if the string match the regex
  regex.hasMatch(testString);   // true

Feel free to use any predefined char groups:

  var regex = VerbalExpression()
	  ..wordChar()..nonWordChar()
	  ..space()..nonSpace()
	  ..digit()..nonDigit();

Define captures:

  var expression = VerbalExpression()
   ..find("a")
   ..beginCapture()..find("b")..anything()..endCapture()
   ..then("cd");
   
  RegExp regex = expression.toRegExp();

  var match = regex.firstMatch(text);
  print(match.group(0)); // returns "abcd"
  print(match.group(1)); // returns "b"

Examples

More examples are in example file

Features and bugs

Please find feature requests and bugs at the issue tracker.

Other implementations

You can view all implementations on VerbalExpressions.github.io

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