R Programming — Complete Guide

What Is R?

R is a programming language and environment for statistical computing and data visualization, created by statisticians.

Regex for Email Validation — Pattern Explained with Examples

The standard regex pattern for validating email addresses according to RFC 5322 — matches local part, @ symbol, and domain with subdomains.

Vectors — Complete Guide

R vectors are the fundamental data type, supporting vectorized operations that apply functions to every element at once.

Regex for US Phone Numbers — Pattern Explained with Examples

The regex pattern for validating US phone numbers in various formats — with or without country code, parentheses, dashes, and dots.

Data Frames — Complete Guide

R data frames are tabular data structures equivalent to spreadsheets, combining equal-length vectors as columns.

Regex for International Phone Numbers — Pattern Explained with Examples

A flexible regex pattern for validating international phone numbers with country codes — supports E.164 format and common writing styles.

Factors and Categorical Data — Complete Guide

R factors store categorical data with predefined levels, essential for statistical modeling and plotting.

Regex for URL Validation — Pattern Explained with Examples

A comprehensive regex pattern for validating URLs — supports HTTP, HTTPS, FTP, subdomains, paths, query strings, and fragments.

Lists and Matrices — Complete Guide

R lists hold mixed data types, while matrices are two-dimensional arrays of a single type.

Regex for IPv4 Address — Pattern Explained with Examples

The regex pattern for validating IPv4 addresses — matches each of four octets (0-255) separated by dots with boundary enforcement.

dplyr for Data Wrangling — Complete Guide

dplyr provides intuitive functions for data manipulation: filter, select, mutate, summarise, arrange, and group_by.

Regex for IPv6 Address — Pattern Explained with Examples

The regex pattern for validating IPv6 addresses — supports 8 groups of 4 hex digits, shorthand (::), and mixed IPv4-IPv6 notation.

tidyr for Data Tidying — Complete Guide

tidyr reshapes data between wide and long formats using pivot_longer, pivot_wider, and handling missing values.

RAII (Resource Acquisition Is Initialization) — Explained with Examples

RAII is a C++ programming idiom where resource acquisition is tied to object lifetime, ensuring automatic cleanup when objects go out of scope.

Regex for MAC Address — Pattern Explained with Examples

The regex pattern for validating MAC addresses — supports colon, hyphen, and no-separator formats for 48-bit hardware addresses.

ggplot2 Visualization — Complete Guide

ggplot2 implements the grammar of graphics, building plots layer by layer with data, aesthetics, and geometries.

Regex for HTML Tags — Pattern Explained with Examples

The regex pattern for matching HTML tags — supports opening, closing, self-closing tags, and attributes with quoted values.

Statistical Analysis — Complete Guide

R provides comprehensive statistical tests including t-tests, ANOVA, correlation, and chi-square tests out of the box.

Regex for Credit Card Numbers — Pattern Explained with Examples

Regex patterns for credit card number validation — supports Visa, Mastercard, American Express, Discover, and general Luhn-compatible formats.

Rust Tutorials

Rust is a systems programming language focused on memory safety and concurrency without a garbage collector. It powers Firefox, Dropbox, and Cloudflare.

Linear Regression — Complete Guide

R linear regression with lm() fits models, provides coefficient estimates, p-values, R-squared, and diagnostic plots.

Regex for UUID — Pattern Explained with Examples

The regex pattern for validating UUIDs (Universally Unique Identifiers) — matches all 5 UUID versions in standard 8-4-4-4-12 hex format.

R Markdown — Complete Guide

R Markdown creates reproducible reports combining code, output, and narrative text in a single document.

Regex for Date (YYYY-MM-DD) — Pattern Explained with Examples

The regex pattern for validating dates in YYYY-MM-DD format — validates year, month (01-12), and day (01-31) with separators.

Shiny Web Apps — Complete Guide

Shiny builds interactive web applications directly from R with reactive programming and UI components.

Regex for Date (MM/DD/YYYY) — Pattern Explained with Examples

The regex pattern for validating dates in US MM/DD/YYYY format — validates month, day, and 4-digit year with forward slash separator.

Data Import and Export — Complete Guide

R reads CSV, Excel, JSON, and database data using readr, readxl, jsonlite, and DBI packages.

Regex for Time (HH:MM) — Pattern Explained with Examples

The regex pattern for validating time in 12-hour and 24-hour formats — validates hours and minutes with optional seconds and AM/PM.

The Tidyverse Ecosystem — Complete Guide

The tidyverse includes purrr, stringr, lubridate, forcats, and readr for comprehensive data science workflows.

Regex for ISO 8601 Date/Time — Pattern Explained with Examples

The regex pattern for validating ISO 8601 date-time format — combines date, time, timezone offset in the standard international format.

Advanced Visualization — Complete Guide

R advanced visualization includes interactive plots with plotly, maps with sf/ggplot2, and animations with gganimate.

Regex for ZIP/Postal Code — Pattern Explained with Examples

The regex pattern for validating US ZIP codes — supports 5-digit and ZIP+4 formats with optional hyphen.

Machine Learning — Complete Guide

R machine learning with caret and tidymodels provides classification, regression, clustering, and model evaluation.

Regex for Social Security Number — Pattern Explained with Examples

The regex pattern for validating US Social Security Numbers (SSN) — validates XXX-XX-XXXX format with valid area/group ranges.

Writing Functions — Complete Guide

R functions have lexical scoping, default arguments, and support for both base R and tidyverse evaluation.

Regex for Hex Color Codes — Pattern Explained with Examples

The regex pattern for validating hexadecimal color codes — supports 3-digit and 6-digit hex colors with optional # prefix.

R Packages — Complete Guide

R packages organize reusable code with documentation, tests, and a standardized structure for sharing on CRAN.

Regex for Password Strength — Pattern Explained with Examples

The regex pattern for validating password strength — enforces minimum length, uppercase, lowercase, digit, and special character requirements.

Ruby Tutorials

Ruby is a dynamic, object-oriented scripting language known for its elegant syntax and developer happiness. It powers Ruby on Rails, one of the most popular web frameworks.

data.table for Big Data — Complete Guide

data.table provides fast data manipulation on large datasets with concise syntax and memory efficiency.

Regex for Username/Slug — Pattern Explained with Examples

The regex pattern for validating usernames and URL slugs — alphanumeric characters with underscores, hyphens, and 3-20 character length.

Real-World Projects — Complete Guide

Build R projects for data analysis, reporting, and visualization using the complete R ecosystem.

Regex for File Extension — Pattern Explained with Examples

The regex pattern for extracting and validating file extensions — matches the extension part of a filename after the last dot.

Regex for Base64 — Pattern Explained with Examples

The regex pattern for validating Base64 encoded strings — matches standard A-Za-z0-9+/ padding with correct length constraints.

Regex for Domain Name — Pattern Explained with Examples

The regex pattern for validating domain names — matches subdomains, TLDs, and follows DNS label rules (not starting with hyphen, max 253 chars).

Racket Tutorials

Racket is a general-purpose programming language and a platform for language creation. It's used in education, research, and for building domain-specific.

Regex for Alphanumeric — Pattern Explained with Examples

The regex pattern for validating alphanumeric strings — matches letters (A-Z, a-z) and digits (0-9) with configurable length and optional spaces.

Regex for Numbers (Integer & Decimal) — Pattern Explained with Examples

The regex pattern for validating integer and decimal numbers — supports positive/negative, optional decimals, leading zeros, and scientific notation.

Regex for CVV — Pattern Explained with Examples

The regex pattern for validating credit card CVV/CVC codes — matches 3-digit (Visa, MC, Discover) and 4-digit (Amex) security codes.

Regex for UK Postcode — Pattern Explained with Examples

The regex pattern for validating UK postcodes — matches the format [A-Z][A-Z]?[0-9][A-Z0-9]? [0-9][A-Z]{2} with required space.

Regex for Canadian Postal Code — Pattern Explained with Examples

The regex pattern for validating Canadian postal codes — matches A#A #A# format with alternating letter-digit pattern and required space.

Regex for Semantic Version (SemVer) — Pattern Explained with Examples

The regex pattern for validating semantic version numbers — matches MAJOR.MINOR.PATCH format with optional pre-release and build metadata.

Regex for ISBN — Pattern Explained with Examples

The regex pattern for validating ISBN-10 and ISBN-13 — matches both formats with optional hyphens and validates check digit position.

Regex for Coordinates (Latitude/Longitude) — Pattern Explained with Examples

The regex pattern for validating geographic coordinates — matches latitude (-90 to 90) and longitude (-180 to 180) in decimal degrees format.

Rust Ownership Basics — Complete Guide

Learn Rust ownership rules ensuring every value has exactly one owner, preventing memory leaks and data races at compile time without a garbage collector.

Rust Borrow Checker — Complete Guide

Learn the Rust borrow checker that enforces references follow aliasing rules, allowing either one mutable reference or many immutable references at a time.

Rust Lifetime Elision — Complete Guide

Learn Rust lifetime elision rules that let the compiler infer common lifetime patterns automatically, reducing annotation noise in function signatures.

Rust Lifetime Generics — Complete Guide

Learn Rust generic lifetime parameters for annotating relationships between references and ensuring they live as long as their inputs in complex programs.

Rust impl Trait Argument — Complete Guide

Learn Rust impl Trait in argument position for accepting any type implementing a trait without writing explicit generics, simplifying function signatures.

Rust Async Await — Complete Guide

Learn Rust async and await syntax for writing asynchronous code that runs concurrently without threads, using futures and executors for efficient I/O.

Rust Rc and Arc Smart Pointers

Learn Rust Rc and Arc smart pointers for shared ownership, enabling multiple references to the same heap data with reference counting and thread safety.