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====== Text Processing with Regular Expressions ======

**Adapted from**: Chapter 4 of Robert W. Sebasta, //Programming the World-Wide Web//, 3rd Edition, Addison Wesley, 2006. **Supporting**: [[eg-259:lecture7|Contact Hour 10]]. 


Write, test and debug (if necessary) HTML files that include JavaScript scripts for the following problems. When required to write functions, you must include a script to test the function with at least two different data sets.


===== 1. Exercises from the Lecture =====

  - //Input//: A text string, using ''prompt''; //Output//: either legal name or Illegal name, depending on whether the input string fits the required format, which is:  //Last name, first name, middle initial// where neither of the names can have more than 15 characters.
  - //Input//: A text string, using ''prompt''; //Output//: The words of the input text, in alphabetical order
  - //Function//: ''tst_name''; //Parameter//: a string; //Returns//: ''true'' if the given string has the form: ''string1, string2, letter'' where both strings must be all lowercase letters except the first letter, and //letter// must be uppercase; ''false'' otherwise.
  - Use the function developed in Exercise 3 to validate a form with a text field that captures the user's name when the user presses the submit button. The form should not submit data if the name is not in the correct format. Use the example given in the session as a template.
  - Repeat exercise 4 using the built-in HTML5 ''pattern'' attribute to validate the name as defined in Exercise 3.



===== 2. Additional Exercises =====

Try these if you need or want more practice. All exercises are from Chapter 4 of Robert W. Sebasta, //Programming the World-Wide Web//, 3rd Edition, Addison Wesley, 2006.

  - Modify the script for Exercise 1.2 to get a second input from the user, which is either ''"ascending"'' or ''"descending"''. Use this input to determine how to sort the input words.
  - //Function//: ''e_names''; //Parameter//: An array of names, represented as strings. //Returns//: The number of names in the given array that end in either ''"e"'' or ''"y"''.
  - //Function//: ''first_vowel''; //Parameter//: A string. //Returns//: The position in the string of the leftmost vowel.
  - //Function//: ''reverser''; //Parameter//: A number. //Returns//: The number with its digits in reverse order.







===== 3. Practical Exercises =====

  * Copy and paste the following text into the //Target// window of [[/eg-259/examples/lecture7/regexpal/index.html|RegexPal]] or [[/eg-259/examples/lecture7/JRX.html|JRX]]

  Xooo
  oXoo
  ooXo
  oooX
  
  ABCDEFGHIJKLMNOPQRSTUVWXYZ
  abcdefghijklmnopqrstuvwxyz
  0123456789 `|\<>,./?#~'@;:[]{}=+-_)(*&^%$£"!
  
  +44 (1792) 295580
  
  some.one@swan.ac.uk
  
  Some wiki text with words in //italic// and **bold**. Like //this// or **that**.
  
  ----
  Alice was beginning to get very tired of sitting by her sister on the bank, and of having
  nothing to do: once or twice she had peeped into the book her sister was reading, but it
  had no pictures or conversations in it, `and what is the use of a book,' thought Alice
  `without pictures or conversation?'
  
  So she was considering in her own mind (as well as she could, for the hot day made her
  feel very sleepy and stupid), whether the pleasure of making a daisy-chain would be worth
  the trouble of getting up and picking the daisies, when suddenly a White Rabbit with pink
  eyes ran close by her.
  
  There was nothing so very remarkable in that; nor did Alice think it so very much out of
  the way to hear the Rabbit say to itself, `Oh dear! Oh dear! I shall be late!' (when she
  thought it over afterwards, it occurred to her that she ought to have wondered at this,
  but at the time it all seemed quite natural); but when the Rabbit actually took a watch
  out of its waistcoat-pocket, and looked at it, and then hurried on, Alice started to her
  feet, for it flashed across her mind that she had never before seen a rabbit with either a
  waistcoat- pocket, or a watch to take out of it, and burning with curiosity, she ran
  across the field after it, and fortunately was just in time to see it pop down a large
  rabbit-hole under the hedge.
  ----
  
  End of File

  * Write regular expressions to match:
    - any non-blank line of text.
    - any //proper// word((That is as we normally understand the term ... not the ''\w'' definition)).
    - the telephone number.
    - ''"X"'' followed by up to two ''"o"'' characters
    - one or more ''"o"'' character followed by ''"X"''
    - any upper case vowel
    - any lowercase consonant
    - any punctuation character
    - the email address
    - the domain name of the email address.
    - the user name part of the email address.
    - the words in italics in the wiki text.
    - the start of each sentence in the quotation from Alice in Wonderland.

  * Take any (or all) of the example JavaScript programs from the last three lectures and explore them in //Firebug// using the console, console logger and debugger.


----


[[eg-259:homework:home|More Homework Exercises]]