Fix regular expressions with /[^]/ (#168)

Fixes #146
sebastienros · Jun 15, 2021 · d9dabfa · d9dabfa
1 parent c053278
commit d9dabfa
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diff --git a/src/Esprima/Scanner.cs b/src/Esprima/Scanner.cs
@@ -1549,6 +1549,13 @@ public Token ScanTemplate()
                 tmp = Regex.Replace(tmp, "[\uD800-\uDBFF][\uDC00-\uDFFF]", astralSubstitute);
             }
 
+            // .NET doesn't support [^] which is equivalent to `[^.]`
+            // c.f. https://github.com/sebastienros/esprima-dotnet/issues/146
+            if (tmp.Contains("[^]"))
+            {
+                tmp = tmp.Replace("[^]", "[^.]");
+            }
+
             // First, detect invalid regular expressions.
             var options = ParseRegexOptions(flags);
 

diff --git a/test/Esprima.Tests/RegExpTests.cs b/test/Esprima.Tests/RegExpTests.cs
@@ -21,5 +21,17 @@ private static Regex CreateRegex(string code)
             var token = new Scanner(code, options).ScanRegExp();
             return (Regex) token.Value;
         }
+
+        [Theory]
+        [InlineData(@"/[^]*? (:[rp] [el] a[\w -]+)[^]*/")]
+        [InlineData(@"/[^]/")]
+        [InlineData(@"/[^ ]/")]
+        public void ShouldParseRegularExpression(string regexp)
+        {
+            var parser = new JavaScriptParser(@"var O = " + regexp);
+            var program = parser.ParseScript();
+
+            Assert.NotNull(program);
+        }
     }
 }