Readable Regexps With Rrrex

Building regular expressions using language - introducing a Ruby DSL I built.

Transcript

1. Readable Regexps With TRegexp github.com/iangreenleaf @iangreenleaf blog.iangreenleaf.com
2. self.inspect
3. Ian Young
4. Used to do PHP
5. Rails is much better
6. work for AMCO Online (huzzah)
7. 2 SDRuby meetings (including this one)
8. TRegexp
9. Why?
10. Because I can
11. Because I love regexps
12. ...but...
13. /^(\+\d)*\s*(\(\d{3}\)\s*)*\d{3}(-{0,1}|\s{0,1})\
14. What if we used words?
15. less compact
16. but friendlier
17. Examples!
18. "Your string" =~ /string/
19. "Your string".rmatch? do "string" end
20. "abc".rmatch? { "ab" + "c" }
21. "abc".rmatch? { "xyz".or "abc" }
22. Ever tried to search for "&"?
23. "symbols.*&+galore".rmatch? { ".*&+" }
24. Precedence
25. "abc".rmatch? { "ab" + ( "z".or "c" ) }
26. Repetition
27. "aaa".rmatch? { 1.or_more "a" } "aaa".rmatch? { 5.or_less "a" } "aaa".rmatch? { 3.exactly "a" } "aaa".rmatch? { (1..5).of "a" }
28. "aaa".rmatch? { 0.or_more "a" } "aaa".rmatch? { any "a" }
29. "aaa".rmatch? { 1.or_more "a" } "aaa".rmatch? { some "a" }
30. Character sets
31. "abc1234.&*".rmatch? { 10.exactly any_char }
32. "abc".rmatch? { 3.exactly letter }
33. "1234".rmatch? { 4.exactly digit }
34. "abc_123".rmatch? { 7.exactly word_char }
35. " ".rmatch? { whitespace }
36. "abc".rmatch? { 3.exactly "a".."c" }
37. Negation
38. "x".rmatch? { word_char.not "x" } # => nil "y".rmatch? { word_char.not "x" }
39. "x".rmatch? { _not "x" } # => nil "y".rmatch? { _not "x" }
40. Grouping
41. Works the old way
42. match = "abc".rmatch do group( "a" + group( "b" ) ) + "c" end match.to_a #=> [ "abc", "ab", "b" ]
43. Named groups
44. match = "abcde".rmatch? do group( :word, any( word_char ) ) end match[ :word ] #=> "abcde"
45. Or use blocks
46. match = "abcde".rmatch? do group :word do any word_char end end match[ :word ] #=> "abcde"
47. order = "1234567890 Central Processing" match = order.rmatch? do group :serial do some digit end \ + some whitespace + \ group :source do any any_char end end puts "Order #" + match[ :serial ] puts "Shipped from " + match[ :source ]
48. Apply brakes
49. "experimental"
50. Monkey patches one or two teeny tiny unimportant little core libs
51. fixnum.rb range.rb string.rb
52. Refinements will make this awesome
53. Now what?
54. It turned out pretty cool
55. Need a better name
56. Could add more syntax
57. Taking suggestions
58. def zero_width_positive_lookbehind ... end
59. No.
60. Kiddie pool?
61. Other applications?
62. kthx github.com/iangreenleaf @iangreenleaf blog.iangreenleaf.com