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Regex cheat sheet & developer notes

Regex cheat sheet and 3 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Regex

Regular Expressions

Regular Expressions. Syntax Reference. # Character classes . any character except newline \d digit [0-9] \D non-digit \w word char [a-zA-Z0-9_] \W non-word char \s whitespace (space, tab, newline) \S non-whitespace [abc]…

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02 · Regex

Common Patterns

Common Regex Patterns. A collection of battle-tested patterns for validating and extracting common data formats in JavaScript and TypeScript.. Validation Patterns. // Email (simplified but practical) const emailRe = /^[^…

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03 · Regex

Regex Fundamentals

Regex Fundamentals. Regular expressions are patterns for matching character combinations in strings. In JavaScript, regex literals are written as /pattern/flags or constructed via new RegExp(pattern, flags).. Character C…

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TypeScriptgeneral

Interview Questions

TypeScript Interview Questions. Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices:. Fundamentals. 1. What is TypeScript?. TypeScript is a…

Mar 28, 2026
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TypeScriptgeneral

Advanced Types (Generics & Utility Types)

TypeScript Advanced Types. Generics. // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred //…

Mar 3, 2026
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