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Ruby StringScanner unscan用法及代碼示例


StringScanner#unscan():unscan()是StringScanner類方法,它將掃描指針設置為上一個位置

用法:StringScanner.unscan()

參數:StringScanner值


返回:將掃描指針設置到上一個位置

示例1:

# Ruby code for StringScanner.unscan() method 
  
# loading StringScanner 
require 'strscan'
  
# declaring StringScanner  
c = StringScanner.new("Mon Sep 12 2018 14:39") 
  
c.scan(/\w+/)  
# unscan() method 
puts "String Scanner unscan form : #{c.unscan()}\n\n"
  
c.scan(/./) 
# unscan() method 
puts "String Scanner unscan form : #{c.unscan()}\n\n"

輸出:

String Scanner unscan form : #

String Scanner unscan form : #

示例2:

# Ruby code for StringScanner.unscan() method 
  
# loading StringScanner 
require 'strscan'
  
# declaring StringScanner  
c = StringScanner.new("h ello geeks") 
c.scan(/\w+/)  
# unscan() method 
puts "String Scanner unscan form : #{c.unscan()}\n\n"
  
c.scan(/./) 
# unscan() method 
puts "String Scanner unscan form : #{c.unscan()}\n\n"

輸出:

String Scanner unscan form : #

String Scanner unscan form : #

注意:
由於係統中的枚舉數或指針值不同,因此輸出可能會有所不同。



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注:本文由純淨天空篩選整理自mayank5326大神的英文原創作品 Ruby | StringScanner unscan function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。