StringScanner#unscan():unscan()是StringScanner类方法,它将扫描指针设置为上一个位置
用法:StringScanner.unscan()
参数:StringScanner值
返回:将扫描指针设置到上一个位置
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"
输出:
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"
输出:
String Scanner unscan form : # String Scanner unscan form : #
注意:
由于系统中的枚举数或指针值不同,因此输出可能会有所不同。
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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 unscan 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。