不过我的规格有点棘手：

describe TextFormatter do 
 
  def l(input) 
    TextFormatter.gsub_links!(input){|link| "!!#{link}!!"}
  end
 
  it "should detect simple links" do
    l("http://www.cnn.com").should == "!!http://www.cnn.com!!"
  end
 
  it "should detect multi links" do
    l("http://www.cnn.com http://boats.com?help.asp").should == "!!http://www.cnn.com!! !!http://boats.com?help.asp!!"
  end
 
  it "should compensate for parans properly" do 
    l("(http://this.is?hello_world)").should == "(!!http://this.is?hello_world!!)"
  end
 
  it "should ignore existing links" do 
    s = "<A HREF='http://sam.com'> http://sam.com </A>"
    l(s.dup).should == s
  end
 
  it "should allow parans" do 
    l("http://sam.com.au?(red)").should == "!!http://sam.com.au?(red)!!"
  end
 
end

任何想法如何实现毛茸茸的正则表达式：

这是我到目前为止的地方(它未通过2次测试)：

def gsub_links!(input)
    regex = /https?\:\/\/[\-\w+&@#\/%?=~\(\)\|!:,.;]*[\-\w+&@#\/%=~_\(\)|]/
    input.gsub!(regex) { |link|
      yield link
    }
  end