fixes #1724: regular expressions beginning with `*`

also normalised capitalisation in a few error messages

lib/coffee-script/lexer.js

@@ -72,7 +72,7 @@
           id = new String(id);
           id.reserved = true;
         } else if (__indexOf.call(RESERVED, id) >= 0) {
-          this.error("Reserved word \"" + word + "\"");
+          this.error("reserved word \"" + word + "\"");
         }
       }
       if (!forcedIdentifier) {
@@ -194,7 +194,11 @@
       }
       if (!(match = REGEX.exec(this.chunk))) return 0;
       regex = match[0];
-      this.token('REGEX', regex === '//' ? '/(?:)/' : regex);
+      if (regex.match(/^\/\*/)) {
+        this.error('regular expressions cannot begin with `*`');
+      }
+      if (regex === '//') regex = '/(?:)/';
+      this.token('REGEX', regex);
       return regex.length;
     };
 
@@ -338,7 +342,7 @@
       prev = last(this.tokens);
       if (value === '=' && prev) {
         if (!prev[1].reserved && (_ref3 = prev[1], __indexOf.call(JS_FORBIDDEN, _ref3) >= 0)) {
-          this.error("Reserved word \"" + (this.value()) + "\" can't be assigned");
+          this.error("reserved word \"" + (this.value()) + "\" can't be assigned");
         }
         if ((_ref4 = prev[1]) === '||' || _ref4 === '&&') {
           prev[0] = 'COMPOUND_ASSIGN';

src/lexer.coffee

@@ -112,7 +112,7 @@ exports.Lexer = class Lexer
         id  = new String id
         id.reserved = yes
       else if id in RESERVED
-        @error "Reserved word \"#{word}\""
+        @error "reserved word \"#{word}\""
 
     unless forcedIdentifier
       id  = COFFEE_ALIAS_MAP[id] if id in COFFEE_ALIASES
@@ -199,7 +199,9 @@ exports.Lexer = class Lexer
     return 0 if prev and (prev[0] in (if prev.spaced then NOT_REGEX else NOT_SPACED_REGEX))
     return 0 unless match = REGEX.exec @chunk
     [regex] = match
-    @token 'REGEX', if regex is '//' then '/(?:)/' else regex
+    if regex.match /^\/\*/ then @error 'regular expressions cannot begin with `*`'
+    if regex is '//' then regex = '/(?:)/'
+    @token 'REGEX', regex
     regex.length
 
   # Matches multiline extended regular expressions.
@@ -324,7 +326,7 @@ exports.Lexer = class Lexer
     prev = last @tokens
     if value is '=' and prev
       if not prev[1].reserved and prev[1] in JS_FORBIDDEN
-        @error "Reserved word \"#{@value()}\" can't be assigned"
+        @error "reserved word \"#{@value()}\" can't be assigned"
       if prev[1] in ['||', '&&']
         prev[0] = 'COMPOUND_ASSIGN'
         prev[1] += '='

test/regexps.coffee

@@ -38,6 +38,9 @@ test "#764: regular expressions should be indexable", ->
 test "#584: slashes are allowed unescaped in character classes", ->
   ok /^a\/[/]b$/.test 'a//b'
 
+test "#1724: regular expressions beginning with `*`", ->
+  throws -> CoffeeScript.compile '/*/'
+
 
 # Heregexe(n|s)