Introduction to Ruby - Regular Expressions, Match, Scan

"My e-mail address is [email protected]. And you can check out my website at http://www.xyzabc.co.in/" Let's try out a few simple regular expression based techniques to detect 1) The E-mail address  2) Website  3) Domain for the email address. # This is a text fragment from which we're going to look for stuff using regexes. text = "My e-mail address is [email protected]. I have another one too which I check less frequently, [email protected]. And you canheck out my website at http://www.xyzabc.co.in/ " # Note that this is a very simple version of a regex for e-mails and might not be handle many complicated cases and different domain extensions emailRegex = /[^\b\s\t\n]*\@[a-z0-9\-\_]*\.[a-z]{2,4})/i => /[^\b]*\@[a-z0-9\-\_]*\.[com|org|edu|co\.in]/i # Scan returns an array of strings which match the given regex. irb(main):101:0> text.scan(emailRegex) => ["[email protected]", "[email protected]"] # Match will return only the first string which matches the given regex. irb(main):102:0> text.match(emailRegex) => #<MatchData "[email protected]"> #To directly access the string returned by match do this .. irb(main):103:0> text.match(emailRegex).to_s => "[email protected]" Check out some of our other Ruby Tutorials : Introduction to Ruby  Introduction to Ruby and some playing around with the Interactive Ruby Shell (irb)  Introduction to Ruby - Conditional statements and Modifiers: If-then, Unless, Case  Introduction to Ruby Comments - Single and Multi-Line comments  Introduction to Ruby Loops - Using While, Until, For, Break, Next , Redo, Retry  Introduction to Ruby - Arrays - Sorting, Filtering (Select), Transforming, Multi-Dimensional Arrays  Introduction to Ruby - Strings  Introduction to Ruby - Making a Script Executable  Introduction to Ruby - Regular Expressions, Match, Scan  Introduction to Ruby - Computing Factorials Recursively : An Example of Recursion  Introduction to Ruby - Binomial Coefficients (nCr) : An Example of Recursion  Introduction to Ruby - Computing a Power Set : An Example of Recursion  Introduction to Ruby - Towers of Hanoi : An Example of Recursion  Introduction to Ruby - Strings: Substitution, Encoding, Built-In Methods   Basic Data Structures With Ruby  Basic Data Structures in Ruby - Insertion Sort  Basic Data Structures in Ruby - Selection Sort  Basic Data Structures in Ruby - Merge Sort  Basic Data Structures in Ruby - Quick Sort  Functional Programming with Ruby  Basic Data Structures in Ruby - Stack  Basic Data Structures in Ruby - The Queue  Basic Data Structures in Ruby - Linked List - ( A Simple, Singly Linked List)  Basic Data Structures in Ruby - Binary Search Tree

Introduction to Ruby and some playing around with the Interactive Ruby Shell (irb) Introduction to Ruby - Conditional statements and Modifiers: If-then, Unless, Case Introduction to Ruby Comments - Single and Multi-Line comments Introduction to Ruby Loops - Using While, Until, For, Break, Next , Redo, Retry Introduction to Ruby - Arrays - Sorting, Filtering (Select), Transforming, Multi-Dimensional Arrays  Introduction to Ruby - Strings Introduction to Ruby - Making a Script Executable Introduction to Ruby - Regular Expressions, Match, Scan Introduction to Ruby - Computing Factorials Recursively : An Example of Recursion Introduction to Ruby - Binomial Coefficients (nCr) : An Example of Recursion Introduction to Ruby - Computing a Power Set : An Example of Recursion Introduction to Ruby - Towers of Hanoi : An Example of Recursion  Introduction to Ruby - Strings: Substitution, Encoding, Built-In Methods Basic Data Structures in Ruby - Insertion Sort Basic Data Structures in Ruby - Selection Sort Basic Data Structures in Ruby - Merge Sort Basic Data Structures in Ruby - Quick Sort Functional Programming with Ruby Basic Data Structures in Ruby - Stack Basic Data Structures in Ruby - The Queue Basic Data Structures in Ruby - Linked List - ( A Simple, Singly Linked List) Basic Data Structures in Ruby - Binary Search Tree