Code Formatting
March 10, 2026
coding tools and best practices
March 10, 2026
A Practical Guide for Developers
dot matches any character, asterisk means zero or more of the previous pattern, plus means one or more, and question mark means zero or one. Square brackets define character classes, and parentheses create capture groups. Common practical patterns include email validation, URL matching, phone number extraction, and date parsing. For testing regex patterns, always use a dedicated tool with real-time highlighting — our regex tester at COD-AI.com shows matches instantly as you type, highlights capture groups, and explains what each part of your pattern does.:Understanding Hash Functions: MD5 SHA-1 and SHA-256:March 3, 2026:Hash functions are fundamental to modern computing — they convert arbitrary-length data into fixed-length strings that serve as unique fingerprints for data verification, password storage, digital signatures, and data structures. MD5 produces a 128-bit hash and is fast but cryptographically broken — it should only be used for checksums, never for security. SHA-1 produces a 160-bit hash and is also considered insecure for cryptographic purposes since 2017. SHA-256, part of the SHA-2 family, produces a 256-bit hash and remains the current standard for security-sensitive applications. For password hashing, none of these are ideal — use bcrypt, scrypt, or Argon2 instead, as they are designed to be slow and resistant to brute-force attacks.