红宝石 |字符串 =~ 方法

=~()是 Ruby 中的 String 类方法，用于匹配目的。如果给定对象是正则表达式，则此方法将使用它作为匹配给定字符串的模式。

Syntax: str =~ obj

Parameters: Here, str is the given string and obj is the object to be matched.

Returns: The position of the match starts or nil if there is no match.

示例 1：

#ruby 2.3.1 
     
# Ruby program to demonstrate
# the =~ method
     
# Taking a string and
# using the method
puts "ayucd7845ef" =~ /\d/
  
#returns nil for this
puts "String" =~ 77

输出：

5

示例 2：

#ruby 2.3.1 
     
# Ruby program to demonstrate
# the =~ method
     
# Taking a string and
# using the method
puts "952364127" =~ /\d/
  
puts "String123" =~ /\d/

输出：

0
6