fix syntax error with semi-colons in strings

lib/less/parser.js

@@ -852,7 +852,7 @@ less.Parser = function Parser(env) {
                 if (c === '.' || c === '#' || c === '&') { return }
 
                 if (name = $(this.variable) || $(this.property)) {
-                    if ((name.charAt(0) != '@') && (match = /^([^@+\/*(;{}-]*);/.exec(chunks[j]))) {
+                    if ((name.charAt(0) != '@') && (match = /^([^@+\/'"*(;{}-]*);/.exec(chunks[j]))) {
                         i += match[0].length - 1;
                         value = new(tree.Anonymous)(match[1]);
                     } else if (name === "font") {

test/css/strings.css

@@ -12,4 +12,5 @@
   quotes: "'" "'";
   content: '""#!&""';
   empty: '';
+  semi-colon: ';';
 }

test/less/strings.less

@@ -12,4 +12,5 @@
   quotes: "'" "'";
   content: '""#!&""';
   empty: '';
+  semi-colon: ';';
 }