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Jessica Brown

A blog by Jessica Brown in CodeName Blogs

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Tutorials

First Look at How a Regex Engine Works Internally (Page 6)

Understanding how a regex engine processes patterns can significantly improve your ability to write efficient and accurate regular expressions. By learning the internal mechanics, you’ll be better equipped to troubleshoot and refine your regex patterns, reducing frustration and guesswork when tackling complex tasks. Types of Regex Engines There are two primary types of regex engines: Text-Directed Engines (also known as DFA - Deterministic Finite Automaton) Regex-Directed Engines (also known as
Tutorials

Different Regular Expression Engines (Page 2)

A regular expression engine is a software component that processes regex patterns, attempting to match them against a given string. Typically, you won’t interact directly with the engine. Instead, it operates behind the scenes within applications and programming languages, which invoke the engine as needed to apply the appropriate regex patterns to your data or files. Variations Across Regex Engines As is often the case in software development, not all regex engines are created equal. Different
Tutorials

Character Classes or Character Sets (Page 7)

Character classes, also known as character sets, allow you to define a set of characters that a regex engine should match at a specific position in the text. To create a character class, place the desired characters between square brackets. For instance, to match either an a or an e, use the pattern [ae]. This can be particularly useful when dealing with variations in spelling, such as in the regex gr[ae]y, which will match both "gray" and "grey." Key Points About Character Classes: A character
Tutorials

Alternation with the Vertical Bar or Pipe Symbol (Page 11)

Previously, we explored how character classes allow you to match a single character out of several possible options. Alternation, on the other hand, enables you to match one of several possible regular expressions. The vertical bar or pipe symbol (|) is used for alternation. It acts as an OR operator within a regex. Basic Syntax To search for either "cat" or "dog," use the pattern: cat|dog You can add more options as needed: cat|dog|mouse|fish The regex engine will match any of these options. Fo
Tutorials

Adding Comments to Regular Expressions: Making Your Regex More Readable (Page 26)

Regular expressions can quickly become complex and difficult to understand, especially when dealing with long patterns. To make them easier to read and maintain, many modern regex engines allow you to add comments directly into your regex patterns. This makes it possible to explain what each part of the expression does, reducing confusion and improving readability. How to Add Comments in Regular Expressions The syntax for adding a comment inside a regex is: (?#comment) The text inside the parent

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