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Regular Expressions with Ruby Elle Meredith – @aemeredith

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Test Extract Change

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/fox/ =~ "The quick brown fox" Basic Matching

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/fox/ =~ "The quick brown fox" => 16 Basic Matching

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/cat/ =~ "The quick brown fox" => nil Basic Matching

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/cat/ !~ "The quick brown fox" => true Basic Matching

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MatchData string = "The quick brown fox jumps over the lazy dog”

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MatchData string = "The quick brown fox jumps over the lazy dog” ! matchdata = string.match /fox/ => #

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MatchData matchdata.to_s => "fox"

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MatchData matchdata.pre_match => "The quick brown "

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MatchData matchdata.post_match => " jumps over the lazy dog"

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Captures string = "03APR2014" ! string.match /\D{3}/

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Captures string = "03APR2014" ! string.match /\D{3}/

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Captures string = "03APR2014" ! string.match /\D{3}/

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Captures string = "03APR2014" ! string.match /\D{3}/ => #

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Captures md = string.match /(.*)(\D{3})(.*)/

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Captures md = string.match /(.*)(\D{3})(.*)/

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Captures md = string.match /(.*)(\D{3})(.*)/

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Captures md = string.match /(.*)(\D{3})(.*)/ => #

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Captures md.captures => ["03", "APR", "2014"]

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Captures md = string.match /(.*)(\D{3})(.*)/ => #

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Captures md[1] => "03" md[2] => "APR" md[3] => "2014"

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Named Captures md = string.match /(?.*)(? \D{3})(?.*)/ => #

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Named Captures md = string.match /(?.*)(? \D{3})(?.*)/ => #

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Named Captures md = string.match /(?.*)(? \D{3})(?.*)/ => #

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Named Captures md = string.match /(?.*)(? \D{3})(?.*)/ => #

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Named Captures md['day'] => "03"

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Look Around string = ''' I love my job, I love the pay! I love it more and more each day. I love my boss, he is the best! I love his boss and all the rest. '''

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Look Around string.scan /love my/ => ["love my", "love my”]

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Positive Lookahead string.scan /love my (?=job)/ => ["love my "]

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Changing things string.gsub(/love/, 'hate')

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Changing things string.gsub(/love/, 'hate') => "\nI hate my job, I hate the pay! \nI hate it more and more each day.\nI hate my boss, he is the best!\nI hate his boss and all the rest.\n"

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Changing things string.gsub!(/\she/, ' she').gsub!(/ his/, 'her')

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Changing things string.gsub!(/\she/, ' she').gsub!(/ his/, 'her')

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Changing things string.gsub!(/\she/, ' she').gsub!(/ his/, ‘her') => "\nI love my job, I love the pay! \nI love it more and more each day. \nI love my boss, she is the best!\nI love her boss and all the rest.\n"

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Regular Expressions with Ruby Elle Meredith – @aemeredith