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Using Laravel for Advanced String Manipulation in PHP

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Introduction

Introduction PHP and Laravel Version

What Are Strings?

A Brief History of Character Encodings Unicode and UTF-8 Implementing Upper and Lowercase Functions Iterating Multibyte Strings Iterating UTF-8 Strings Accessing Individual Characters in a UTF-8 String Managing Character Encodings Types of PHP Strings Backticks and Laravel String Helpers Quiz Yourself on Strings Challenge: Iterating UTF-32 strings Solution: Iterating UTF-32 Strings

Fluent Strings

Converting Fluent String Objects to Strings Conditional String Logic

The Formatting Helper Methods

Formatting Strings with Camel Casing Formatting Headlines Formatting Strings with Kebab Casing Lowercasing the First Character of a String Creating Lowercase Variants of Strings Reversing the Characters of a String Creating a URL Friendly Slug From a Title Formatting Strings with Snake Casing Removing Extra Whitespace from a String Formatting Strings with Studly Casing Formatting Strings with Title Casing Uppercasing the First Character of a String Generating Uppercased Variants of Strings Counting the Number of Words in a String Quiz Yourself on Formatting Helper Methods Challenge: The Formatting Helper Methods Solution: The Formating Helper Methods

The Logical Helper Methods

Checking If a String Contains Another String Checking If a String Contains Multiple Substrings Checking If a String Ends with Another String Checking If a String Starts with Another String Checking If a String Contains Only ASCII Characters Quiz Yourself on Logical Helper Methods

The Construction Helper Methods

Transliterating Characters to ASCII Generating Excerpts of Text Ensuring a String Always Ends with a Given String Calculating String Length Truncating Strings Obscuring Parts of a String Generating Pseudorandom Strings Removing Substrings or Characters from Strings Repeating Strings and Characters Replacing Substrings Sequentially Replacing Substrings in a String Replacing the First Occurrence of a Substring or Character Replacing the Last Occurrence of a Substring or Character Ensuring Strings Always Begin with a Specific Prefix Replacing a Key/Value Pair of Strings within a String Splitting Strings on Uppercase Characters Quiz Yourself on Construction Helper Methods Challenge: Robust Text Processing Module Solution: Robust Text Processing Module

The Extraction Helper Methods

Returning Part of a String after Another String or Character Returning a Substring after the Last Occurrence of a String Returning Part of a String before Another String or Character Retrieving All Content before the Last Occurrence of a Substring Retrieving Content between Two Search Strings Retrieving the Smallest Amount of Content between Two Strings Limiting the Number of Words in a String Getting Portions of a String Counting Occurrences of a Search String Replacing Strings within a Portion of an Existing String Quiz Yourself on Extraction Helper Methods Challenge: Text Manipulation Application Solution: Text Manipulation Application

Padding Strings

Padding the Beginning of Strings Padding the End of Strings Padding Both Sides of a String Quiz Yourself on Padding Strings

String Translations and Extension

Working with Variable Replacements Managing the Ranges of Items Singular and Plural Word Forms Extending Strings with Macros and Mixins Quiz Yourself on String Translations

Lines and Words

Introduction to Lines and Words Positions, Lines, and Columns Splitting Strings into Words Counting Word Occurrences Finding Frequent and Repeated Words Stop Words Constructing Initialisms and Acronyms Calculating Estimated Reading Time Locating Words at Arbitrary Positions Locating Neighbouring Words and Characters Retrieving Adjacent Lines Managing Text Indentation Implementing an IndentationManager Class Quiz Yourself on Lines and Words Challenge: Determining the Number of Spaces per Indentation Solution: Determining the Number of Spaces per Indentation Challenge: Counting the Number of Unique Words Solution: Counting the Number of Unique Words

Applied Techniques: Writing a Gherkin Parser

Modeling Gherkin

A Gherkin Lexer

Implementation of Gherkin Comments

Parsing Step Text

Parsing Gherkin Descriptions

Parsing Scenario Tags

Parsing Step Parameters

Parsing Doc Strings

Parsing Gherkin Tables

Parsing Scenario Examples

Implementing Our Gherkin Parser: Parsing a Single Scenario

Parsing Scenario Outlines

Parsing Multiple Scenarios

Parsing Features

Adding Localization Support to the Gherkin Parser

Other Applications of Indentation-Based Parsers

Quiz Yourself on Applied Techniques of a Gherkin Parser

Challenge: Loading Locales from an External Source

Solution: Loading Locales from an External Source

Markov Chains and Text Generation

Writing a Markov Text Generator Weighted Randomised Selection Improving Our Text Generator Quiz Yourself on Markov Chains and Text Generation

Fixed Width Data Parsing

Managing Data Conversions I Managing Data Conversions II Updating an Individual Record’s Values Techniques for Managing Text Truncation Quiz Yourself on Fixed Width Data Parsing Challenge: Storing Arbitrarily Large Amounts of Data Solution: Storing Arbitrarily Large Amounts of Data

Splitting Strings

Basic String Splitting Splitting Strings Using Regular Expressions Extracting YAML Frontmatter from Documents Parsing Single-File Components Splitting Input Containing Substrings with the Delimiter Splitting Strings Using Cursors Implementing the Strings Cursor Creating a String Cursor Using Additional Utility Methods A Simple PHP Tokenizer Working with SQL-Style Strings Splitting Strings Containing Paired Brackets Quiz Yourself on Splitting Strings

Applied Techniques: A Blade Directive Validator

Scaffolding the Parser Implementation Parsing Blade Directives Parsing Directive Parameters Validating Blade Directives Validating Blade Directives Quiz Yourself on the Blade Directive Validator Challenge: Parsing Blade Echos Solution: Parsing Blade Echos

Working with HTML

Reversing Double Encoded HTML Entities Working with Embedded Languages Parsing Fragmented HTML Documents Parsing HTML Attributes and Parameters Analyzing Fragmented HTML Documents Quiz Yourself on Working with HTML Challenge: Add a Class List to a Specific Paragraph Solution: Add a Class List to a Specific Paragraph

Regular Expressions

Regular Expression Syntax Primer Analyzing Different Types of Regular Expressions Quiz Yourself on Regular Expressions Challenge: Adjust the Pattern to Return the Required Matches Solution: Adjust the Pattern To Return the Required Matches

Conclusion

Appendix

Parsing Gherkin Descriptions

Learn how to parse gherkin descriptions using the Gherkin class.

Gherkin supports the concept of free-form descriptions, which can be added to features, scenarios, backgrounds, scenario outlines, and rules. These descriptions are indented below the Gherkin construct they belong to, just like anything else, and can contain any content as long as the lines do not start with any Gherkin keyword. The code snippet below provides an example of a Gherkin description:

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