// String regex patterns, searching, and replacement
// Demonstrates contains(), find(), replace() and practical use cases

print("=== contains() - Check if string exists ===")
print(contains("hello world", "world"))           // true
print(contains("The Quick BROWN fox", "brown"))   // true (case-insensitive default)
print(contains("hello", "HELLO", true))           // false (case-sensitive with exact=true)

print("\n=== find() - Locate pattern matches ===")
// find() returns array of match objects with {text, pos, len}
matches = find("hello world hello", ~hello~)
print(format_json(matches))  // Shows position and text of each match

// Extract just the matched text using map()
texts = map(matches, function(m) return m.text end)
print(texts)  // ["hello", "hello"]

print("\n=== find() - Regex patterns ===")
// Find email pattern
emails = find("Contact: john@example.com or jane@example.org", ~\w+@\w+\.\w+~)
print("Emails found:")
for match in emails do
  print("  " + match.text + " at position " + match.pos)
end

// Find numbers in text
numbers_text = "Price: $19.99, Quantity: 5 items, Discount: 10%"
numbers = find(numbers_text, ~\d+~)
extracted = map(numbers, function(m) return tonumber(m.text) end)
print("Numbers extracted: " + format_json(extracted))

print("\n=== replace() - Simple substitution ===")
// Case-insensitive (default)
result = replace("Hello World", "world", "Duso")
print(result)  // "Hello Duso"

// Case-sensitive with exact=true
result = replace("Test test TEST", "test", "x", true)
print(result)  // "Test x TEST" (only exact lowercase matches)

print("\n=== replace() - Regex patterns ===")
// Replace multiple patterns
text = "Price $19.99, Cost $5.50"
result = replace(text, ~\$\d+\.\d+~, "[REDACTED]")
print("Redacted: " + result)

// Clean up whitespace
messy = "hello   world    foo"
clean = replace(messy, ~\s+~, " ")
print("Cleaned: '" + clean + "'")

print("\n=== Practical: Extract and transform with map() ===")
// Parse log entries
logs = [
  "2025-01-30 10:45:23 ERROR Database connection failed",
  "2025-01-30 10:45:24 INFO Retrying connection",
  "2025-01-30 10:45:25 ERROR Timeout"
]

// Extract timestamps and levels
parsed = map(logs, function(line)
  timestamp_match = find(line, ~\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}~)
  level_match = find(line, ~ERROR|INFO~)

  timestamp = len(timestamp_match) > 0 ? timestamp_match[0].text : ""
  level = len(level_match) > 0 ? level_match[0].text : ""

  return {
    timestamp = timestamp,
    level = level,
    message = line
  }
end)

for entry in parsed do
  print(entry.timestamp + " [" + entry.level + "] " + entry.message)
end

print("\n=== Performance tip ===")
// For checking if a pattern exists, contains() is faster than find()
// Use contains() when you just need yes/no, find() when you need match details
if contains("test@example.com", ~[a-z]+@[a-z]+\.[a-z]+~) then
  print("Valid email format detected")
end