regex - Remove part of string before last "/" -

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i want remove before /query .. e.g

i have no idea regular expressions doing difficult me

note : reference should /query link mentioned below may have different patterns - www.abcd.wsd/asd/asdcd/asrr/query=xyz

www.html.com/query=abcd

should result 

 query = abcd

a generic regex solution extract query appearing after last / , followed characters other / is

s <- c("www.abcd.wsd/asd/asdcd/asrr/query=xyz","www.html.com/query=abcd","www.cmpnt.com/query=fgh/noquery=dd") sub("^.*/(query[^/]*).*$", "\\1", s) ## => "query=xyz"  "query=abcd" "query=fgh"

see this r demo

the regex is

^.*/(query[^/]*).*$

see regex demo

details:

  • ^ - start of string
  • .* - match 0+ characters many possible last
  • / - literal forward slash char
  • (query[^/]*) - capture group 1 matching query substring followed 0+ characters other / (see [^/]* negated character class * quantifier)
  • .* - 0 or more characters to
  • $ - end of string.

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