I have a phpBB forum and I want to merge the different urls Google Analytics throws up into 1, eg:


I'd like them all to point to


I devised the following regEx filter:

Search and replace -> filter field: Request URI

Search string: \/forum\/viewtopic\.php\?f=([0-9]*)&t=[0-9]

Replace string: \/forum\/viewtopic\.php\?t=([0-9]+)$

It doesn't work, I am not sure what I am missing here. Any help?

  • 1
    The replace string can not be a regex again. Also when you do ?f=([0-9]*) it forces f= to be there, so your second URL will not match as it has ?t=6457. And when you do &t=[0-9] the [0-9] means a single character taken from the set of 0 to 9, so in your first URL &t=6457 won't match the regex as it has 4 characters, not one. You need [0-9]+ to match multiple digits. Sep 19, 2019 at 22:57

2 Answers 2


Search string: \/forum\/viewtopic\.php\?f=([0-9]*)&t=[0-9]

  • Replace f with [a-z] to capture any character between a and z.
  • + to capture one or more of the parameter (16 or 6457, etc..) but if you know the exact length of this string you can replace it with {1,5} for example.
  • capture everything after : .*


If you provide more urls to capture I can edit and try to adjust the regex.

  • What I think I understand now is that a search and replace will not work, see eg. stackoverflow.com/questions/13742484/…. I am using an advanced filter to get rid of the f=. Field A \/forum\/viewtopic\.php\?(f=([0-9]+))(.*), Field B nothing, Output \/forum\/viewtopic\.php\?$A2 Not sure if it's going to work. If it does, I can use a second one to get rid of all that comes behind t=1234 Sep 20, 2019 at 6:22
  • 1
    Changed Field A to \/forum\/viewtopic\.php\?(f=([0-9]+))&(t=([0-9]+))(.*) Sep 20, 2019 at 7:14

Found the solution, with thanks to Patrick Mevzek and jpmg:

Filter type needed to be advanced, not search and replace.

Field A: \/forum\/viewtopic\.php\?(f=([0-9]+))&(t=([0-9]+))(.*)

Field B: -

Output: \/forum\/viewtopic\.php\?$A3

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