July 2017
Intermediate to advanced
434 pages
12h 59m
English
Content preview from FreeSWITCH 1.8
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Regular Expressions
Regular expressions (regex, regexes) are at the heart of dialplan, and used in many other parts of FreeSWITCH configuration.
They are an uber-clever way to analyze, slice, dice, and massage text strings. We in FreeSWITCH we use the best and brightest, the greatest regular expressions of them all: Perl Compatible Regular Expressions (PCRE). Isn't that beautiful? It is.
A regular expression checks if a string matches a pattern (the pattern being the regex). A regular expression can also substitute parts of the strings with something else. Also, regular expressions can "select" a part of a string, and reuse it in returning the result.
In dialplan regexes are used to define the "expression" criterion of the "condition" tag. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.