How to use the regular expression functions provided by the ‘re’ library to match, search, and replace text in your Python programs. Regular expressions, or “regex,” is a system for finding complex ...

I'm wearing my regex dunce cap again. I want to return a positive match if I find "this" in a string, but not if I find "this" and also "that" in the string. Put another way: I want to return a ...

I was involved in a recent discussion on the "best" way to remove a given parameter from a URL string. The conversation began with using string primitives to split and join the parameter, a method ...

The String.split methods can be very convenient for easily splitting a provided String based on a provided regular expression String. The only trick is figuring out a regular expression token to use ...

Regular expressions give Tim Patrick the creeps, but he overcame his fears by discovering specially crafted regex patterns can access data in a way that’s actually kind of cool. I've always been ...

Let’s say we need a JavaScript function that will take a string of tagged text (that is, it contains Extensible Markup Language (XML) markup) and return only the tags (and not the text that the tags ...

These are the formal rules for forming basic UNIX regular expressions. For some simple examples, skip to Simple Examples. The rules come from the Solaris 7 regexp(5) manual page. The I2A2 reflector ...

There are times during development when you need to match text against a search phrase. NSString offers a few simple built-in routines that offer basic comparison options. For example, use ...

Whether you are parsing logs or validating input, using regular expressions is a great way to accomplish both of these things. The problem is: regular expressions can be hard and that will only grow ...