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Ruby | Regexp named_captures() function
  • Last Updated : 18 Dec, 2019

Regexp#named_captures() : named_captures() is a Regexp class method which returns a hash representing information about named captures of regular expression. A key of the hash is a name of the named capture produces a formatted string-version of the regular expression.

Syntax: Regexp.named_captures()

Parameter: Regexp values

Return: a hash representing information about named captures of regular expression

Example #1 :



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# Ruby code for Regexp.named_captures() method
   
# declaring Regexp value
reg_a = /a/
   
# declaring Regexp value
reg_b = /geeks/
   
# declaring Regexp value
reg_c = /a/
   
   
#  named_captures method
puts "Regexp named_captures form : #{reg_a.named_captures}\n\n"
   
puts "Regexp named_captures form : #{reg_b.named_captures}\n\n"
   
puts "Regexp named_captures form : #{reg_c.named_captures}\n\n"

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Output :

Regexp named_captures form : {}

Regexp named_captures form : {}

Regexp named_captures form : {}

Example #2 :

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# Ruby code for Regexp.named_captures() method
  
# declaring Regexp value
reg_a = /geeks/
  
# declaring Regexp value
reg_b = /problem/
  
# declaring Regexp value
reg_c = /code/
  
  
#  named_captures method
puts "Regexp named_captures form : #{reg_a.named_captures}\n\n"
  
puts "Regexp named_captures form : #{reg_b.named_captures}\n\n"
  
puts "Regexp named_captures form : #{/(?<goio>.)(?<goio>.)/.named_captures}\n\n"

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Output :

Regexp named_captures form : {}

Regexp named_captures form : {}

Regexp named_captures form : {"goio"=>[1, 2]}
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