How to replace part of string using regex

I want to replace all the :

xmlns="http://xml.blablabla"

and

 xmlns:something="xxx开发者_C百科x"

for a white space from a string.

Thanks

str.sub!(/xmlns=.+?"/, ' ')

String#sub is your friend:

my_string = '<Fare_MasterPricerCalendarReply xmlns="http://xml.blablabla">'
my_string.sub(/\s.+$/, " >")
# => "<Fare_MasterPricerCalendarReply >"

Use this regex: xmlns="[^"]*", it matches xmlns="http://xml.blablabla", then replace match with empty string.