关于Ruby字符串变量

Question

我有可以有我想利用这个变量的这可能是前两个整数值的值1.10.2.ab2-4.cl6或1.11.2.ab2-4.dl5或1.13.2.ab2-4.el6

1.10或1.11或1.13和红宝石字符串变量执行算术然后打印您好，如果值是< 1.13

Answer 1

假设这些版本字符串，你可以使用Gem::Version和Gem::Requirement：

requirement = Gem::Requirement.new('< 1.13') 

requirement.satisfied_by? Gem::Version.new('1.10.2.ab2-4.cl6') #=> true 
requirement.satisfied_by? Gem::Version.new('1.11.2.ab2-4.dl5') #=> true 
requirement.satisfied_by? Gem::Version.new('1.13.2.ab2-4.el6') #=> false