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4 useful things

Validates if email address format is correct

function validateEmail(email) {
  const regex = /^[^s@]+@[^s@]+.[^s@]+$/;
  return regex.test(email);
}

Validate password strength with configurable rules

function validatePassword(password, options = {}) {
  const defaults = {
    minLength: 8,
    requireUppercase: true,

Powerful text manipulation commands for searching, filtering, and transforming text data.

# Grep patterns
grep "pattern" file.txt
grep -r "error" /var/log/      # Recursive
grep -i "warning" file.txt     # Case insensitive

Advanced sed patterns for complex text manipulation, line editing, and batch processing.

# Basic substitution
sed 's/old/new/g' file.txt

# Replace only on specific lines

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