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Jessica Brown

A blog by Jessica Brown in CodeName Blogs

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Tutorials

Literal Characters (Page 3)

The simplest regular expressions consist of literal characters. A literal character is a character that matches itself. For example, the regex «a» will match the first occurrence of the character "a" in a string. Consider the string "Jack is a boy": this pattern will match the "a" after the "J". It’s important to note that the regex engine doesn’t care where the match occurs within a word unless instructed otherwise. If you want to match entire words, you’ll need to use word boundaries, a concep
Tutorials

Special Characters (Page 4)

To go beyond matching literal text, regex engines reserve certain characters for special functions. These are known as metacharacters. The following characters have special meanings in most regex flavors discussed in this tutorial: [ \ ^ $ . | ? * + ( ) If you need to use any of these characters as literals in your regex, you must escape them with a backslash (\). For instance, to match "1+1=2", you would write the regex as: 1\+1=2 Without the backslash, the plus sign would be interpreted as a q
Tutorials

The Dot Matches (Almost) Any Character (Page 8)

The dot, or period, is one of the most versatile and commonly used metacharacters in regular expressions. However, it is also one of the most misused. The dot matches any single character except for newline characters. In most regex flavors discussed in this tutorial, the dot does not match newlines by default. This behavior stems from the early days of regex when tools were line-based and processed text line by line. In such cases, the text would not contain newline characters, so the dot could
Tutorials

Word Boundaries (Page 10)

The \b metacharacter is an anchor, similar to the caret (^) and dollar sign ($). It matches a zero-length position called a word boundary. Word boundaries allow you to perform “whole word” searches in a string using patterns like \bword\b. What is a Word Boundary? A word boundary occurs at three possible positions in a string: Before the first character if it is a word character. After the last character if it is a word character. Between two characters where one is a word character and the ot
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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