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Ruby | StringScanner unscan function
  • Last Updated : 12 Dec, 2019

StringScanner#unscan() : unscan() is a StringScanner class method which set the scan pointer to the previous position

Syntax: StringScanner.unscan()

Parameter: StringScanner values

Return: set the scan pointer to the previous position

Example #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"

Output :

String Scanner unscan form : #

String Scanner unscan form : #

Example #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"

Output :

String Scanner unscan form : #

String Scanner unscan form : #

Note :
The output may vary because of the different Enumerators or pointer value based on you system.

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