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 :
require 'strscan'
c = StringScanner. new ( "Mon Sep 12 2018 14:39" )
c.scan(/\w+/)
puts "String Scanner unscan form : #{c.unscan()}\n\n"
c.scan(/./)
puts "String Scanner unscan form : #{c.unscan()}\n\n"
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Output :
String Scanner unscan form : #
String Scanner unscan form : #
Example #2 :
require 'strscan'
c = StringScanner. new ( "h ello geeks" )
c.scan(/\w+/)
puts "String Scanner unscan form : #{c.unscan()}\n\n"
c.scan(/./)
puts "String Scanner unscan form : #{c.unscan()}\n\n"
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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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