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APPENDIX B RUBY REFERENCE
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sub (and sub!): Substitutes only the first occurrence of the first supplied parameter (or the first match of a supplied regular expression) with the second supplied parameter. For example: "this is a test".sub(/[aeiou]/, "X") == "thXs is a test". sub(exp) (and sub!) with following code block: Invokes the code block for the first occurrence of exp (whether a String or Regexp), substituting that occurrence with the result of the code block. to_f: Attempts to return a Float representing a value depicted in the string. For example: "3.141592 is equal to pi".to_f == 3.141592. to_i: Attempts to return an integer representing a value depicted in the string. For example: "100".to_i == 100. to_sym: Converts the string into a Symbol object. upcase (and upcase!): Converts all characters into upper case.
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Regular Expression Syntax
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Regular expressions are special expressions that can be used to match patterns within strings, and were covered in depth in 3. This section provides a reference for the main elements of regular expression syntax. Regular expressions are usually represented as strings contained within forward slashes, like so:
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/regular expression here/
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Regular expressions can also be contained within %r{ and }, like so:
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%r{regular expression here}
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Regular expression syntax is reasonably standard between programming languages, and Ruby supports most of the standard POSIX regular expression syntax. Therefore, many examples of regular expressions you might find online are also likely to work within Ruby.
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APPENDIX B RUBY REFERENCE
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Regular Expression Options
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When using the forward-slash notation for regular expressions, you can set options for the regular expression by placing letters after the last forward slash, as follows: i: Makes the regular expression case insensitive. Therefore, /test/i matches positively against strings containing 'TEST', 'TeSt', 'tESt', 'test', or any other combination of lower- and upper case letters making up the word test. m: Puts the regular expression into multiline mode where the special character . (usually meaning any character except newline ) matches newlines. Therefore, /.*/m matches the whole of a multiline string, whereas /.*/ alone would only match the first line within that string. x: Makes the regular expression ignore whitespace. This allows you to format the regular expression in a more readable way without worrying about whitespace becoming part of the regular expression. For example, /t e s t/x matches against test. This option is particularly useful if you want to spread out your regular expression over multiple lines for easier reading.
Special Characters and Formations
Regular expressions can contain normal characters (such as letters or digits) and match against these, but you can use special characters to represent more abstract concepts such as any character or any digit. The following are some of the special characters that you can use in regular expressions or to create sub-expressions: .: Matches any character except the newline character. []: Matches a character range or set. See 3 for full details. (): Denotes a sub-expression. For example, (abc)+ matches 'abcabcabc'. |: Separates alternate choices. For example, t|x matches 't' or 'x'. \w: Matches any alphanumeric character or underscore. \W: Matches anything \w doesn t match. \b: Matches a word boundary (but not a specific character). \B: Matches anything \b doesn t match. \d: Matches digits (0 through 9).
APPENDIX B RUBY REFERENCE
\D: Matches anything \d doesn t match (nondigits). \s: Matches whitespace characters (spaces, tabs, newlines, form feeds). \S: Matches anything \S doesn t match (non-whitespace). \A: Matches the beginning of a string. \Z: Matches the end of a string. ^: Matches the beginning of a line (or string). $: Matches the end of a line (or string).
Character and Sub-Expression Suffixes
You can use the following characters after a character, character range, or a sub-expression (as provided within parentheses) to modify how that element is matched by the regular expression: +: Matches one or more of the previous. + : Matches one or more, but as few as possible, of the previous. : Matches zero or one of the previous. *: Matches zero or more of the previous. * : Matches zero or more, but as few as possible, of the previous.
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