Ruby StringScanner peek用法及代碼示例

StringScanner＃peek()：peek()是StringScanner類方法，它返回與string [pos，len]相對應的字符串。

用法：StringScanner.peek()

參數：StringScanner值
len-字符串值的長度

返回：對應於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"

輸出：

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"

輸出：

String Scanner peek form : he

String Scanner peek form : hell

String Scanner peek form : hellogee

相關用法

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