Regular expression for repeating pattern

Question

I have the following input text:

pagelimit=50&filtercolumn=Datacenter&filtervalue=abfg1&filtercolumn=MachineType&filtervalue=fg&filtercolumn=GPG&filtervalue=IPMI

I want to get back

There may be an unlimited amount of these.

I have tried a few things. I'm currently trying something like this:

(?:((filtercolumn=.*&filtervalue=.*)+)?)

But of course it doesn't work. I get:

filtercolumn=Datacenter&filtervalue=abfg1&filtercolumn=MachineType&filtervalue=fg&filtercolumn=GPG&filtervalue=IPMI
filtercolumn=Datacenter&filtervalue=abfg1&filtercolumn=MachineType&filtervalue=fg&filtercolumn=GPG&filtervalue=IPMI

check this post for using regex in Go to split strings. https://stackoverflow.com/questions/4466091/split-string-using-regular-expression-in-go — Keith Aymar, Jul 26 '18 at 19:43
That string looks suspiciously like URL query parameters (the stuff after `http://.../path?`) and if it is then [(net/url).ParseQuery](https://godoc.org/net/url#ParseQuery) might be a useful tool. — David Maze, Jul 27 '18 at 00:35

score 7 · Accepted Answer · edited Jul 26 '18 at 19:52

7

Try this \bfiltercolumn=[^&]*&filtervalue=[^&]*

edited Jul 26 '18 at 19:52

LarsH

answered Jul 26 '18 at 19:39

Definitely works in that site. Now trying to try it out in go. What is the \b doing? – Manther Jul 26 '18 at 19:46
1

It's just a word boundary, it prevents matching something like `autofiltercolumn=...&filtervalue=...` – Jul 26 '18 at 19:48
Probably doing something dumb. but I have `a := regexp.MustCompile("\bfiltercolumn=[^&]*&[^&]*") var c = a.Split(r.URL.RawQuery, -1) ` returns a single item array of: `pagelimit=50&filtercolumn=Datacenter&filtervalue=vin1&filtercolumn=MachineType&filtervalue=sd&filtercolumn=APC&filtervalue=IPMI ` – Manther Jul 26 '18 at 19:55
1

I don't use go lang so I can't help you with regex usage. If the regex works on regex101 under the _golang_ tag, it definitely works in code. I would check to make sure it's a global match and that the `"\b"` doesn't need to be escaped `"\\b"` as well. – Jul 26 '18 at 20:01
1

I just needed to use FindAllString instead of split. Thanks for the help. – Manther Jul 26 '18 at 20:29

1 Answers1