Essential Books

match - Boolean Result

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Returns true or false, which indicates whether the regexp is matched or not without updating $~ and other related variables. If the second parameter is present, it specifies the position in the string to begin the search. 

/R.../.match?("Ruby")    #=> true
/R.../.match?("Ruby", 1) #=> false
/P.../.match?("Ruby")    #=> false

Ruby 2.4+

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Regular Expressions and regex based operations:
* Regular Expressions and Regex Based Operations
* operator
* Regular Expressions in Case Statements
* Groups named and otherwise.
* Quantifiers
* Character classes
* Defining a Regexp
* match - Boolean Result
* Common quick usage
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