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

StringScanner#exist?() : exist?() is a StringScanner class method which returns the value of pointer if the patter exists.

Syntax: StringScanner.exist?()

Parameter: StringScanner values

Return: the value of pointer – if the patter exists otherwise return nil.

Example #1 :






# Ruby code for StringIO.exist?() method
  
# loading StringIO
require 'strscan'
  
# declaring StringIO 
c = StringScanner.new("Fri Dec 12 2018 14:39")
  
# exist?() method
puts "String Scanner exist? form : #{c.exist? /2018/}\n\n"

Output :

String Scanner exist? form : 15

Example #2 :




# Ruby code for StringIO.exist?() method
  
# loading StringIO
require 'strscan'
  
# declaring StringIO 
c = StringScanner.new("hellogeeks")
  
# exist?() method
puts "String Scanner exist? form : #{c.exist? /ge/}\n\n"

Output :

String Scanner exist? form : 7
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