PHP中的正则表达式无效

Question

I'm new to regular expressions. I wrote a pattern like below:

'A/[.]+;'.'B/[.0-9]+;'.'C/[0-9]+;'.'D/[.]+;'.'E/[.0-9]+;'.'F/[.a-zA-Z]+;';

which is meant to match strings such as

"A/U88;B/12.01.5;C/123456;D/4ND8;E/3.56.78;F/Sa.yA;"

But I got an error invalid Regular Expression.

What's wrong about this pattern?

Answer 1

I don't know what that string mean or what you are trying to do, but your regex did have some synthax error in it. First of all, you need to escape the /. Second, I couldn't make it work, so I built one that matches your stirng. I don't know if the order of the letter is important or not.
[ABCDEF](\/)([A-Z0-9.]+);

Here is a working Regex101 with your regex. https://regex101.com/r/jXUqav/1