Ruby正则表达式实践非贪婪量词

作者: 敏捷的水
发布时间:2015-07-01 14:42:01

这里主要是主要非贪婪量词的用法, .+?"的意思是匹配任意字符,直到遇到第一个"

另外是找到匹配的组,如下x[0]

require 'open-uri'  open('http://railslab.newrelic.com/category/masters-interviews') do |f|    s=""    f.each { |line| s<<line}    urls= s.scan(/"(http:\/\/content.newrelic.com\/railslab\/videos\/.+?)"/)    urls.each { |x| puts x[0].to_s }  end
结果是取得了所有rialslab里masters-interviews系列。

http://content.newrelic.com/railslab/videos/railslab-rightscale-cloud-considerations-070109.mov
http://content.newrelic.com/railslab/videos/railslab-rightscale-cloud-considerations.m4v
http://content.newrelic.com/railslab/videos/railslab-heroku-tools-collaboration.mov
http://content.newrelic.com/railslab/videos/railslab-heroku-tools-collaboration.m4v
http://content.newrelic.com/railslab/videos/railslab-heroku-performance-bp.mov
http://content.newrelic.com/railslab/videos/railslab-heroku-performance-bp.m4v
http://content.newrelic.com/railslab/videos/railslab-heroku-intro-vision.mov
http://content.newrelic.com/railslab/videos/railslab-heroku-intro-vision.m4v
http://content.newrelic.com/railslab/videos/railslab-bbg-jproudman-pt2.mov
http://content.newrelic.com/railslab/videos/railslab-bbg-jproudman-pt2.m4v
http://content.newrelic.com/railslab/videos/railslab-bbg-jproudman-pt1.mov
http://content.newrelic.com/railslab/videos/railslab-bbg-jproudman-pt1.m4v
http://content.newrelic.com/railslab/videos/railslab-productmadness-1.mp3
http://content.newrelic.com/railslab/videos/railslab-productmadness-2.mp3
http://content.newrelic.com/railslab/videos/railslab-cunningham-mastery.m4v
http://content.newrelic.com/railslab/videos/railslab-37signals-imbriaco2.m4v

 

 

来源:http://www.cnblogs.com/cnblogsfans/archive/2010/10/12/184869

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