3 Books about Regular expressions [PDF]

Regular expressions are needed, for example, to check the data that the user enters into a form on a website. For example, there is an Email field and we need to check whether the user entered an email or some other nonsense. In programming languages, there are special commands, such as check_expression(string, template), i.e. check whether the string matches a given template. But how do we set this template - for example, in the case of an email, "word - @ - word - dot - domain"? That's what regular expressions were invented for and they are the same for all programming languages.

For example, for an email, a regular expression (in a simplified case) can look like [a-z]+@[a-z]+.(com|net|org). The [a-z]+ piece means several Latin letters. The (com|net|org) piece lists possible options after the dot.

Also, regular expressions are useful when we want to parse the necessary information from some raw data. For example, the Webb telescope produces a data stream and separates space photographs with tags and . In programming languages, there are commands like find_expression(string, template). In this case a regular expression for template may look like ".+" in which the dot means "any symbol" and the plus means any number of symbols.

Here are some PDF books about Regular expressions:

Beginning Regular Expressions
2005 by Andrew Watt


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Mastering Regular Expressions: Understand Your Data and Be More Productive
2006 by Jeffrey E.F. Friedl


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Regular Expressions Cookbook
2009 by Jan Goyvaerts, Steven Levithan


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