实时调试正则表达式，支持匹配、替换、提取
g
i
m
s
\d+
[a-zA-Z]+
[\u4e00-\u9fa5]+
\w+@\w+\.\w+
1[3-9]\d{9}
https?://[^\s]+
\d{4}-\d{2}-\d{2}
#[0-9a-fA-F]{6}
.
\d
\w
\s
*
+
?
{n,m}
^
$
\b
\B
()
(?:)
|
[abc]