对Ruby String变量

Question

我有一个ruby字符串变量，其值为1.10.2.ab2-4.cl6或1.11.2.ab2-4.dl5或1.13.2.ab2-4.el6

我想获取此变量的前两个整数值，可以是1.10或1.11或1.13，然后如果值为< 1.13则打印hello

Answer 1

假设这些是版本字符串，您可以使用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