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    <p>My approach is a bit different (and I think better IMHO :-): I needed to not miss any phone numbers, even if there were 2 on a line. I also didn't want to get lines that had 3 sets of numbers that were far apart (see the cookies example), and I didn't want to mistake an IP address as a phone number.</p> <p>Code to allow multiple numbers per line, but also require sets of digits to be 'close' to each other:</p> <pre><code>def extract_phone_number(input) result = input.scan(/(\d{3})\D{0,3}(\d{3})\D{0,3}(\d{4})/).map{|e| e.join('-')} # &lt;result&gt; is an Array of whatever phone numbers were extracted, and the remapping # takes care of cleaning up each number in the Array into a format of 800-432-1234 result = result.join(' :: ') # &lt;result&gt; is now a String, with the numbers separated by ' :: ' # ... or there is another way to do it (see text below the code) that only gets the # first phone number only. # Details of the Regular Expressions and what they're doing # 1. (\d{3}) -- get 3 digits (and keep them) # 2. \D{0,3} -- allow skipping of up to 3 non-digits. This handles hyphens, parentheses, periods, etc. # 3. (\d{3}) -- get 3 more digits (and keep them) # 4. \D{0,3} -- skip up to 0-3 non-digits # 5. (\d{4}) -- keep the final 4 digits result.empty? ? nil : result end </code></pre> <p>And here are the tests (with a few additional tests)</p> <pre><code>test_data = { "DB=Sequel('postgres://user:username@192.168.1.101/test_test')" =&gt; nil, # DON'T MISTAKE IP ADDRESSES AS PHONE NUMBERS "100 cookies + 950 cookes = 1050 cookies" =&gt; nil, # THIS IS NEW "this 123 is a 456 bad number 7890" =&gt; nil, # THIS IS NEW "212-363-3200,Media Relations: 212-668-2251." =&gt; "212-363-3200 :: 212-668-2251", # THIS IS CHANGED "this is +1 480-874-4666" =&gt; "480-874-4666", "something 404-581-4000" =&gt; "404-581-4000", "other (805) 682-4726" =&gt; "805-682-4726", "978-851-7321, Ext 2606" =&gt; "978-851-7321", "413- 658-1100" =&gt; "413-658-1100", "(513) 287-7000,Toll Free (800) 733-2077" =&gt; "513-287-7000 :: 800-733-2077", # THIS IS CHANGED "1 (813) 274-8130" =&gt; "813-274-8130", "323/221-2164" =&gt; "323-221-2164", "" =&gt; nil, "foobar" =&gt; nil, "1234567" =&gt; nil, } def test_it(test_data) test_data.each do |input, expected_output| extracted = extract_phone_number(input) puts "#{extracted == expected_output ? 'good': 'BAD!'} ::#{input} =&gt; #{extracted.inspect}" end end test_it(test_data) </code></pre> <p>An Alternate implementation: by using "scan" it will automatically apply the regular expression multiple times, which is good if you want to extra more than 1 phone number per line. If you just want to get the first phone number on a line then you could also use:</p> <pre><code>first_phone_number = begin m = /(\d{3})\D{0,3}(\d{3})\D{0,3}(\d{4})/.match(input) [m[1],m[2],m[3]].join('-') rescue nil; end </code></pre> <p>(just a different way of doing things, using the "match" function of RegExp)</p>
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