Coding 101 23: Perl: RegEx Search and Replace

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Ivory Tower

Let's talk about Regular Expressions

In the previous episode, we brushed past Regular Expressions ... OUR BAD!

Defn: At its simplest, A "Regular Expression" or "Regex" is a type of pattern-matching that can be used in searches or find and replace operations.

In a Regex, each character of the string is its own metacharacter that can be combined with other metacharacters to identify patterns and even context
Regular Expressions are used in most modern languages, and figure prominently into modern search engines. Perl is the standard-bearer for Regular Expressions in .NET, Java, Ruby and others

WHAT DOES THIS ALL MEAN?!?!?!

Quite simply... REGEX allows you to find, match and replace patters within any data set.
It lets you search NOT just complete strings, but parts of strings.
You can then replace those strings, or parts of strings with other strings. They're useful to parse files and provide a powerful search and replace tool.

Hosts: Fr. Robert Ballecer, SJ and Shannon Morse

Guest: Patrick Delahanty

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