python - django 正则表达式只匹配字母数字而不是下划线

Question

我有一个模型字段，我希望用户只输入字母数字字符。我已将正则表达式设置为:

validators.RegexValidator(r'^[\w]+$'

它也需要 _ 但我只想使用 aplha 数字字符 而不是 _。它的正则表达式可能是什么？

Answer 1

我们通常使用一个简单的 [A-Za-z0-9] 正则表达式，它本质上是 \w 但没有下划线(假设您没有设置任何特定的语言环境或 unicode 标志):

\w

When the LOCALE and UNICODE flags are not specified, matches any alphanumeric character and the underscore; this is equivalent to the set [a-zA-Z0-9_]. With LOCALE, it will match the set [0-9_] plus whatever characters are defined as alphanumeric for the current locale. If UNICODE is set, this will match the characters [0-9_] plus whatever is classified as alphanumeric in the Unicode character properties database.

另见 Regular Expressions: How to Express \w Without Underscore其他选项。