Ruby StringScanner peek用法及代码示例

StringScanner＃peek()：peek()是StringScanner类方法，它返回与string [pos，len]相对应的字符串。

用法：StringScanner.peek()

参数：StringScanner值
len-字符串值的长度

返回：对应于string [pos，len]的字符串

示例1:

# Ruby code for StringScanner.peek() method 
  
# loading StringScanner 
require 'strscan'
  
# declaring StringScanner  
c = StringScanner.new("Mon Sep 12 2018 14:39") 
  
# peek() method 
puts "String Scanner peek form : #{c.peek(3)}\n\n"
  
# peek() method 
puts "String Scanner peek form : #{c.peek(6)}\n\n"
  
# peek() method 
puts "String Scanner peek form : #{c.peek(9)}\n\n"

输出：

String Scanner peek form : Mon

String Scanner peek form : Mon Se

String Scanner peek form : Mon Sep 1

示例2:

# Ruby code for StringScanner.peek() method 
  
# loading StringScanner 
require 'strscan'
  
# declaring StringScanner  
c = StringScanner.new("hellogeeks") 
  
# peek() method 
puts "String Scanner peek form : #{c.peek(2)}\n\n"
  
# peek() method 
puts "String Scanner peek form : #{c.peek(4)}\n\n"
  
# peek() method 
puts "String Scanner peek form : #{c.peek(8)}\n\n"

输出：

String Scanner peek form : he

String Scanner peek form : hell

String Scanner peek form : hellogee

相关用法

注：本文由纯净天空筛选整理自mayank5326大神的英文原创作品 Ruby | StringScanner peek function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。