红宝石 |字符串 gsub 方法

gsub是 Ruby 中的 String 类方法，用于返回给定字符串的副本，其中所有出现的模式都替换为第二个参数。

Syntax: str.gsub(pattern, replacement)

Parameters: Here, str is the given string. pattern may be specified regex or character set to be removed. replacement is the set of characters which is to be put.

Returns:A copy of the string with all occurrences of pattern substituted for the second argument.

示例 1：

# Ruby program to demonstrate 
# the gsub method 
       
# Taking a string and 
# using the method
puts "Sample".gsub(/[amuyt]/, '*')                 
puts "Program".gsub(/([gmra])/, '<\1>')      

输出：

S**ple
Po

示例 2：

# Ruby program to demonstrate 
# the gsub method 
       
# Taking a string and 
# using the method
puts "Ruby".gsub(/[tyru]/, '<\1>')                 
puts "String".gsub(/([igtr])/, '*')      

输出：

Rb
S***n*