正则表达式验证周和年

Question

I want to validate a string with this pattern: ww/yyyy.

With: ^([0-9]{4}) , I check if the year has 4 digits.

I tried to put these two regex together without success.

(5[0-3]|[1-4][0-9]|0[1-9])/^([0-9]{4})

Answer 1

^ means the start of a line or the start of the string (depends on options on the regex implementation.) So try this:

^(5[0-3]|[1-4][0-9]|0[1-9])/([0-9]{4})$

$ means the end of the line or end of the string.

If you don't include ^ and $ in the pattern, something like this will get matched: foo20/2000bar .

Answer 2

How about other way, though both mean same:

^((0[1-9]|[1-4][0-9]|5[0123])/([0-9]{4}))$

Thanks for your time

Answer 3

(5[0-3]|[1-4][0-9]|0[1-9])/([0-9]{4})为什么需要^字符？