TWiT Throwback (Video)

Coding 101 24: Perl: Command Line Search and Replace

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Ivory Tower

We learned in the last episode that "Regular Expressions" or "RegEx" is just another way of saying, "find a pattern"

We learned that we can use RegEx to search a string for that pattern according to a set of parameters and modifiers that WE determine

The usage of RegEx is as Follows:

$nameofstring =~ (Match Operator) / (expression) / (expression) / (Match Expression Operator)

Which means:

$nameofstring =~ (action to take)/(pattern to match)/(pattern to replace match with)/(how to search)

Useful Match Operators

  • m/ Match Regular Expression
  • s/ Substitite Regular Expression
  • tr/ Tranliterate Regular expression

    • Useful Match Operator Modifiers

    • g Match globally, find ALL occurences
    • i case insensitive
    • m treat string as multiple lines
    • o Evaluate the expression only once
    • s treat string as single line
    • x Use extended regular expressions (Allows you to use white space in the expression)

      • Hosts: Fr. Robert Ballecer, SJ and Shannon Morse

      Guest: Patrick Delahanty

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