Download - The Bastards Book of Regular Expressions

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Finding a proper text editor 15In Rubular, all instances where this simple regular expression matches the text – i.e., “cat” – arehighlighted:’cat’ on rubular.comOK, let’s add some actual regex syntax. Try this:cat\b’cat\b’ on rubular.comRubular will immediately highlight a new selection. In this case, it actually unselects the “cat” that ispart of “catapult” and “catatonic”. As we’ll soon find out, that \b we added narrowed the selection tojust the word “cat”, just in case we want to replace it with “mouse” but not end up with “mouseapult”and “mouseatonic”Here’s a slightly more useful regular expression example. Copy and paste the following text intoRubular’s field titled Your test string:
Finding a proper text editor 16Yesterday, at 12 AM, he withdrew $600.00 from an ATM. He then spent $200.12 ongroceries. At 3:00 P.M., he logged onto a poker site and played 400 hands of poker. Hewon $60.41 at first, but ultimately lost a net total of $38.82.Pasting text into RubularIn the field titled, Your regular expression:, type in backslash-d:\dIn the field titled, Match result, you’ll see that every numerical digit is highlighted:
Page 1: The Bastards Book ofRegular Express
Page 5 and 6: CONTENTSOptionality and alternation
Page 7 and 8: CONTENTSSwitching visualizations (T
Page 9 and 10: Regular Expressions are for Everyon
Page 11 and 12: Regular Expressions are for Everyon
Page 13 and 14: Getting Started6
Page 15 and 16: Finding a proper text editor 8Notep
Page 17 and 18: Finding a proper text editor 10Edit
Page 19 and 20: Finding a proper text editor 12Text
Page 21: Finding a proper text editor 14does
Page 25 and 26: Finding a proper text editor 18A do
Page 27 and 28: A better Find-and-Replace 20The lim
Page 29 and 30: A better Find-and-Replace 22Using R
Page 31 and 32: Your first regex 24helloThe Find-an
Page 33 and 34: Your first regex 26The regex syntax
Page 35 and 36: Your first regex 28Double-bounded
Page 37 and 38: Your first regex 30AnswerFind \bcat
Page 39 and 40: Removing emptinessIt’s funny how
Page 41 and 42: Removing emptiness 34Now let’s do
Page 43 and 44: Removing emptiness 36…as opposed
Page 45 and 46: Removing emptiness 38Replacement in
Page 47 and 48: Match one-or-more with the plus sig
Page 55 and 56: Match zero-or-more with the star si
Page 57 and 58: Specific and limited repetition 501
Page 59 and 60: Specific and limited repetition 52E
Page 61 and 62: Specific and limited repetition 54C
Page 63 and 64: Anchors: A way to trim emptinessIn
Page 65 and 66: Anchors: A way to trim emptiness 58
Page 71 and 72: Matching any letter, any number 64A
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Matching any letter, any number 66W
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Matching any letter, any number 68[
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Matching any letter, any number 70R
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Matching any letter, any number 72F
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Matching any letter, any number 74A
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Negative character sets 76$1,200.00
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Negative character sets 78\W+Exerci
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Capture, Reuse 80Find (ba)+Matches
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Capture, Reuse 82.- then the 1st ba
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Capture, Reuse 84In English We are
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Capture, Reuse 86ApplesOraclesOrang
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Capture, Reuse 8805-14-8912-03-9803
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Capture, Reuse 90Mary asked: "What
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Optionality and alternationThe two
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Optionality and alternation 94Answe
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Optionality and alternation 96Studi
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Optionality and alternation 98You m
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Laziness and greediness 100Being to
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Laziness and greediness 102Replace
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Laziness and greediness 104With the
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Lookarounds 106cat(?=s)- will match
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Lookarounds 108`(?
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Lookarounds 110ExerciseGiven the fo
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Lookarounds 112City,CountryAlbuquer
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Lookarounds 114Given this list of c
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Lookarounds 116100,J.D. Salinger Av
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Lookarounds 1186,300|Apples|New Yor
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Lookarounds 120^(\d+) Record ID (\w
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Lookarounds 122d. Remove all asides
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From Data to HTML (TODO)This chapte
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From Data to HTML (TODO) 126Turning
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The ExercisesI’ve never been one
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Data Cleaning with the Stars 130LOR
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Data Cleaning with the Stars 132[GM
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Finding needles in haystacks (TODO)
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Changing phone format (TODO)Todo: T
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Changing phone format (TODO) 138Exe
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Changing phone format (TODO) 140Ans
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Changing phone format (TODO) 142`1-
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Changing phone format (TODO) 144(\d
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Dating, Associated Press Style (TOD
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Sorting a police blotter 154Sloppy
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Sorting a police blotter 156I used
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Converting XML to tab-delimited dat
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Converting XML to tab-delimited dat
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Cleaning up Microsoft Word HTML(TOD
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Cleaning up OCR Text (TODO)Image sc
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Moving forwardThank you for taking
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