Add ranges for ERE

Author: leoluyi

regex.html

@@ -89,7 +89,7 @@ <h1>Syntax</h1>
     <tr><td>Custom character class</td><td><code>[...]</code></td><td><code>[...]</code></td><td><code>[...]</code></td><td><code>[...]</code></td><td><code>[...]</code></td></tr>
     <tr><td>Negated custom character class</td><td><code>[^...]</code></td><td><code>[^...]</code></td><td><code>[^...]</code></td><td><code>[^...]</code></td><td><code>[^...]</code></td></tr>
     <tr><td>\ special in class?</td><td>yes</td><td>yes</td><td>no, <code>]</code> escaped if comes first</td><td>no, <code>]</code> escaped if comes first</td><td>yes</td></tr>
-    <tr><td>Ranges</td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td><td><code>[a-z]</code>, <code>-</code> escaped if first or last</td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td><td></td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td></tr>
+    <tr><td>Ranges</td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td><td><code>[a-z]</code>, <code>-</code> escaped if first or last</td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td><td><code>[a-z]</code>, <code>-</code> escaped if first or last</td><td><code>[a-z]</code>, <code>-</code> escaped if comes last</td></tr>
     <tr><td>Alternation</td><td><code>|</code></td><td><code>|</code></td><td><code>\|</code></td><td><code>|</code></td><td><code>\|</code> <code>\&amp;</code> (low precedence)</td></tr>
     <tr><td>Escaped character</td><td><code>\033</code> <code>\x1B</code> <code>\x{1234}</code> <code>\N{name}</code> <code>\N{U+263D}</code></td><td><code>\x12</code></td><td class="na"></td><td class="na"></td><td><code>\%d123</code> <code>\%x2A</code> <code>\%u1234</code> <code>\%U1234ABCD</code></td></tr>
   </tbody>