Regular Expression Tutorial - Learn How to Use Regular Expressions - The Diigo Meta page

• 18 Sep 17
  

  Diego Santimateo

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• 10 Jul 17
  

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  • regular expression is a pattern describing a certain amount of text
  • regular expressions are highlighted in red
  • Matches are highlighted in blue
  • Word boundaries and quantifiers are blue
  • escaped literals are gray
  • character classes are orange
  • purple for meta tokens
  • green for grouping
  • "string" to indicate the text that the regular expression is applied to

  7 more annotations...

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  • Mark the "Regular expression" checkbox, and click the Find First button.
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  • rogrammer, your software will run faster since even a simple regex engine applying the above regex once will outperform a state of the art plain text search algorithm searching through the data five times. Regular expressions also reduce development time. With a regex engine, it takes only one line (e.g. in Perl, PHP, Python, Ruby, Java, or .NET) or a couple of lines (e.g. in C using PCRE) of code to,
• 24 Jun 14
  

  lucaskaim

  Regular Expression regex

  • his tutorial teaches you all you need to know to be able to craft powerful time-saving regular expressions. It starts with the most basic concepts, so that you can follow this tutorial even if you know nothing at all about regular expressions yet.

    The tutorial doesn't stop there. It also explains how a regular expression engine works on the inside, and alert you at the consequences. This helps you to quickly understand why a particular regex does not do what you initially expected. It will save you lots of guesswork and head scratching when you need to write more complex regexes.
  • The tutorial doesn't stop there. It also explains how a regular expression engine works on the inside, and alert you at the consequences. This helps you to quickly understand why a particular regex does not do what you initially expected. It will save you lots of guesswork and head scratching when you need to write more complex regexes.
  • Basically, a regular expression is a pattern describing a certain amount of text. Their name comes from the mathematical theory on which they are based. But we will not dig into that. You will usually find the name abbreviated to "regex" or "regexp". This tutorial uses "regex", because it is easy to pronounce the plural "regexes". On this website, regular expressions are printed as regex highlighted in red.

  • Basically, a regular expression is a pattern describing a certain amount of text. Their name comes from the mathematical theory on which they are based. But we will not dig into that. You will usually find the name abbreviated to "regex" or "regexp". This tutorial uses "regex", because it is easy to pronounce the plural "regexes". On this website, regular expressions are printed as regex highlighted in red.

    This first example is actually a perfectly valid regex. It is the most basic pattern, simply matching the literal text regex. A "match" is the piece of text, or sequence of bytes or characters that pattern was found to correspond to by the regex processing software. Matches are highlighted in blue on this site.

    \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b is a more complex pattern. It describes a series of letters, digits, dots, underscores, percentage signs and hyphens, followed by an at sign, followed by another series of letters, digits and hyphens, finally followed by a single dot and between two and four letters. In other words: this pattern describes an email address.
  • This first example is actually a perfectly valid regex. It is the most basic pattern, simply matching the literal text regex. A "match" is the piece of text, or sequence of bytes or characters that pattern was found to correspond to by the regex processing software. Matches are highlighted in blue on this site.

  3 more annotations...

• 28 Feb 14
  

  mdluis

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  • Regular Expressions Tutorial
    Learn How to Use and Get The Most out of Regular Expressions
  • Regular Expressions Tutorial
    Learn How to Use and Get The Most out of Regular Expressions
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  In this tutorial, I will teach you all you need to know to be able to craft powerful time-saving regular expressions. I will start with the most basic concepts, so that you can follow this tutorial even if you know nothing at all about regular expressions yet.

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  Learn How to Use and Get The Most out of Regular Expressions
  
  In this tutorial, I will teach you all you need to know to be able to craft powerful time-saving regular expressions. I will start with the most basic concepts, so that you can follow this tutorial even if you know nothing at all about regular expressions yet.
  
  But I will not stop there. I will also explain how a regular expression engine works on the inside, and alert you at the consequences. This will help you to understand quickly why a particular regex does not do what you initially expected. It will save you lots of guesswork and head scratching when you need to write more complex regexes."

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  • I will use the term "string" to indicate the text that I am applying the regular expression to. I will highlight them in
  • Examples are the open source PCRE engine (used in many tools and languages like PHP)
• 23 May 11
  

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  • a regular expression is a pattern describing a certain amount of text
  • A regular expression "engine" is a piece of software that can process regular expressions
  • trying to match the pattern to the given string.

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