Jul 3rd 2014
Coding 101 24
Perl: Command Line Search and Replace
Hosted by
Fr. Robert Ballecer, SJ,
Shannon Morse
Learn search and replace in Perl.
Although the show is no longer in production, you can enjoy episodes from the TWiT Archives.
Guests:
Patrick Delahanty
The Code for today's show is available at our: Github
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)
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