正则表达式，用于传递URL和失败的CIDR掩码

I have strings that can be URLs or CIDR-blocks. I want to determine whether a string is the path of a URL e.g.:

/9this can be/a/path123
/test
/r

or a CIDR-mask (/0 to /32):

/24
/12
/32

I want the regex to exclude CIDR-masks from the matches.

This is what I have so far:

^[/?]((?!([0-9]|[1-2][0-9]|3[0-2]))(?=[\S]))[\S ]*$

Which works, except for the case where the URL-path starts with a number:

/23example

I'm coding in Go, if that matters.

Maybe this will be adequate:

^[\/?].*[a-zA-Z].*$

See https://regex101.com/r/dw6Dtw/1

All it does is ensure that there's a letter in the path somewhere

I doubt that you might want to have a complex expression to pass those, maybe just adding a quantifier with 2 plus alpha would pass that. Maybe, an expression similar to this would suffice:

(.+?[a-z]{2,}[0-9]?.+)

DEMO

RegEx

If this expression wasn't desired or my assumptions were incorrect, it can be modified or changed in regex101.com.

RegEx Circuit

jex.im also helps to visualize the expressions.