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。