ruby string examples

ruby.string.rb

irb(main):023:0> "".respond_to? "=~"
=> true
irb(main):024:0> "".respond_to? "match"
=> true
irb(main):030:0> Regexp.compile("").respond_to? "match"
=> true
irb(main):032:0> Regexp.compile("").respond_to? "=~"
=> true

正则表达式匹配
irb(main):035:0> "http://www.haojii.com".match(/http:\/\/(www\.)?(\w*)(\.)?(com|net|cn)/)
=> #<MatchData "http://www.haojii.com" 1:"www." 2:"haojii" 3:"." 4:"com">

字符串替换
irb(main):039:0> "http://www.haojii.com".gsub("o","-")   #gsub全部替换
=> "http://www.ha-jii.c-m"
irb(main):043:0> "http://www.haojii.com".sub("o","-")     #sub只替换第一个匹配到的
=> "http://www.ha-jii.com"