Try parse

lib/version.dart

@@ -251,6 +251,18 @@ class Version implements Comparable<Version> {
     }
     return 0;
   }
+
+  /// Creates a [Version] instance from a string.
+  ///
+  /// The string must conform to the specification at http://semver.org/
+  /// Returns null if the string is empty or does not conform to the spec.
+  static Version? tryParse(String source) {
+    try {
+      return Version.parse(source);
+    } on FormatException {
+      return null;
+    }
+  }
 
   static bool _isNumeric(String? s) {
     if (s == null) {

test/version_test.dart

@@ -270,6 +270,43 @@ void main() {
     expect(() => Version.parse("1.0.0+not^safe"), throwsFormatException);
     expect(() => Version.parse("1.0.0-not^safe"), throwsFormatException);
   });
+
+
+  test("TryParse tests", () {
+    expect(Version.tryParse("0"), equals(new Version(0, 0, 0)));
+    expect(Version.tryParse("0.0.0"), equals(new Version(0, 0, 0)));
+    expect(Version.tryParse("1"), equals(new Version(1, 0, 0)));
+    expect(Version.tryParse("1.0"), equals(new Version(1, 0, 0)));
+    expect(Version.tryParse("1.2.1"), equals(new Version(1, 2, 1)));
+    expect(Version.tryParse("0.5.3"), equals(new Version(0, 5, 3)));
+    expect(Version.tryParse("0.0.3"), equals(new Version(0, 0, 3)));
+    expect(Version.tryParse("1.2.3.5"), equals(new Version(1, 2, 3)));
+    expect(Version.tryParse("99999.55465.5456"),
+        equals(new Version(99999, 55465, 5456)));
+    expect(Version.tryParse("1.0.0-alpha"),
+        equals(new Version(1, 0, 0, preRelease: <String>["alpha"])));
+    expect(Version.tryParse("1.0.0+build"),
+        equals(new Version(1, 0, 0, build: "build")));
+    expect(
+        Version.tryParse("1.0.0-alpha+build"),
+        equals(new Version(1, 0, 0,
+            build: "build", preRelease: <String>["alpha"])));
+    expect(
+        Version.tryParse("1.0.0-alpha.beta+build"),
+        equals(new Version(1, 0, 0,
+            build: "build", preRelease: <String>["alpha", "beta"])));
+
+    expect(
+        Version.tryParse("1.0.0-az.AZ.12-3+az.AZ.12-3"),
+        equals(new Version(1, 0, 0,
+            build: "az.AZ.12-3", preRelease: <String>["az", "AZ", "12-3"])));
+
+    expect(Version.tryParse("a"), isNull);
+    expect(Version.tryParse("123,4322"), isNull);
+    expect(Version.tryParse("123a"), isNull);
+    expect(Version.tryParse("1.0.0+not^safe"), isNull);
+    expect(Version.tryParse("1.0.0-not^safe"), isNull);
+  });
 
   test("Increment tests", () {
     expect(new Version(1, 0, 0).incrementMajor(), equals(new Version(2, 0, 0)));