Ruby newb：如何提取子字符串？

Question

I'm trying to scrape a CBS sports page for shot data in the NBA. Here is the page I'm starting out with and using as a sample: http://www.cbssports.com/nba/gametracker/shotchart/NBA_20131115_MIL@IND

In the source, I found a string that contains all the data that I need. This string, in the webpage source code, is directly under var CurrentShotData = new.

What I want is to turn this string in the source into a string I can use in ruby. However, I'm having some trouble with the syntax. Here's what I have.

require 'nokogiri'
require 'mechanize'

a = Mechanize.new
a.get('http://www.cbssports.com/nba/gametracker/shotchart/NBA_20131114_HOU@NY') do    |page|
shotdata = page.body.match(/var currentShotData = new String\(\"(.*)\"\)\; var  playerDataHomeString/m)[1].strip
print shotdata
end

I know I must be doing this wrong... it seems so needlessly complex and on top of that it isn't working for me. Could someone enlighten me on the simple way to get this string into Ruby?

Answer 1

Try to replace:

shotdata = page.body.match(/var currentShotData = new String\(\"(.*)\"\)\; var  playerDataHomeString/m)[1].strip

with:

shotdata = page.body.match(/var currentShotData = new String\(\"(.*?)\"\)\; var  playerDataHomeString/m)[1].strip

changing the (.*) with (.*?) will cause a lazy evaluation (matching of minimal number of characters) of the string which is the behavior you want.