擅长:python、mysql、java
<p>使用负前瞻<code>(?!.*[,])</code></p>
<pre><code>class ItemTag(models.Model):
name_regex = re.compile("^(?!.*[,]).*$")
name = models.CharField('Tag Name', max_length = 20, unique = True,
validators=[RegexValidator(regex=name_regex)] )
class Meta:
ordering = ['name']
</code></pre>