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Later, mathematician Stephen Kleene described these models using his mathematical notation called regular sets and developed regular expressions as a notation for describing them.

Afterward, Ken Thompson, one of the key creators of the Unix Operating System, built regular expressions into Unix-based text tools like qed, (predecessor of the Unix ed) and grep.

You also find regex engines ready to roar in most programming languages—such as C#, Python, Perl, PHP, Java, Java Script and Ruby. At this stage, this is a semantic question—it depends on what one means by regular expression. When I was a young dinosaur, I didn't take the time to properly learn the syntax, largely because I really didn't feel like learning another language.

Let's compress the definition from the earlier paragraphs: A regex is a text string that describes a pattern that a regex engine uses in order to find text (or positions) in a body of text, typically for the purposes of validating, finding, replacing or splitting. That topic and other juicy details are discussed on the page about Regex vs. Before we dive in—and only if you have time—I'd like to introduce this site and what makes it special. Who needs regex, I thought, when your programming language has functions that let you dig into strings from the left, the middle and the right?

In the 1940s, two mathematicians, Warren Mc Culloch and Walter Pitts, described the nervous system by modeling neurons.xs) # Turn on free-spacing and DOTALL modes /\* # Match a forward slash and a star (? \*/) # Blah [- *_/ \] # Blah blah )* # Blah blah blah (.*? # Yadda yadda blah \*/ # Match a star and a forward slash No doubt about it, even with comments and breathing room, there is something raw and experimental about writing a regex pattern.Besides, how well your pattern performs doesn't only depend on applying correct syntax.And you could use the regex to find digits within underscores (as in _12_) and to replace the underscores with double dashes, yielding --12--, something you could not do with a conventional search-and-replace (details for that technique are in the recipe about replacing one delimiter with another).Who does this work of finding, replacing, splitting? For instance, you can find regex engines in text editors such as Notepad and Edit Pad Pro.




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