curl --request POST \
  --url https://api.iotools.cloud/v1/tool/regex-cheatsheet \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "searchPattern": "",
  "category": "all"
}
'

{
  "tool": "regex-cheatsheet",
  "tool_version": "1.0.1",
  "outputs": {
    "cheatsheet": [
      {
        "pattern": "^",
        "description": "Start of string / line",
        "example": "^Hello",
        "category": "Anchors"
      },
      {
        "pattern": "$",
        "description": "End of string / line",
        "example": "world$",
        "category": "Anchors"
      },
      {
        "pattern": "\\b",
        "description": "Word boundary",
        "example": "\\bword\\b",
        "category": "Anchors"
      },
      {
        "pattern": "\\B",
        "description": "Non-word boundary",
        "example": "\\Bword\\B",
        "category": "Anchors"
      },
      {
        "pattern": "\\A",
        "description": "Start of string (absolute)",
        "example": "\\AHello",
        "category": "Anchors"
      },
      {
        "pattern": "\\Z",
        "description": "End of string (absolute)",
        "example": "end\\Z",
        "category": "Anchors"
      },
      {
        "pattern": ".",
        "description": "Any character except newline",
        "example": "a.c",
        "category": "Character Classes"
      },
      {
        "pattern": "\\d",
        "description": "Digit (0-9)",
        "example": "\\d{3}",
        "category": "Character Classes"
      },
      {
        "pattern": "\\D",
        "description": "Non-digit",
        "example": "\\D+",
        "category": "Character Classes"
      },
      {
        "pattern": "\\w",
        "description": "Word character (a-z, A-Z, 0-9, _)",
        "example": "\\w+",
        "category": "Character Classes"
      },
      {
        "pattern": "\\W",
        "description": "Non-word character",
        "example": "\\W+",
        "category": "Character Classes"
      },
      {
        "pattern": "\\s",
        "description": "Whitespace (space, tab, newline)",
        "example": "\\s+",
        "category": "Character Classes"
      },
      {
        "pattern": "\\S",
        "description": "Non-whitespace",
        "example": "\\S+",
        "category": "Character Classes"
      },
      {
        "pattern": "[abc]",
        "description": "Character set (a, b, or c)",
        "example": "[aeiou]",
        "category": "Character Classes"
      },
      {
        "pattern": "[^abc]",
        "description": "Negated set (not a, b, or c)",
        "example": "[^0-9]",
        "category": "Character Classes"
      },
      {
        "pattern": "[a-z]",
        "description": "Character range",
        "example": "[a-zA-Z]",
        "category": "Character Classes"
      },
      {
        "pattern": "*",
        "description": "Zero or more",
        "example": "ab*c",
        "category": "Quantifiers"
      },
      {
        "pattern": "+",
        "description": "One or more",
        "example": "ab+c",
        "category": "Quantifiers"
      },
      {
        "pattern": "?",
        "description": "Zero or one (optional)",
        "example": "colou?r",
        "category": "Quantifiers"
      },
      {
        "pattern": "{n}",
        "description": "Exactly n times",
        "example": "\\d{4}",
        "category": "Quantifiers"
      },
      {
        "pattern": "{n,}",
        "description": "n or more times",
        "example": "\\d{2,}",
        "category": "Quantifiers"
      },
      {
        "pattern": "{n,m}",
        "description": "Between n and m times",
        "example": "\\d{2,4}",
        "category": "Quantifiers"
      },
      {
        "pattern": "*?",
        "description": "Zero or more (lazy)",
        "example": "<.*?>",
        "category": "Quantifiers"
      },
      {
        "pattern": "+?",
        "description": "One or more (lazy)",
        "example": "\\w+?",
        "category": "Quantifiers"
      },
      {
        "pattern": "??",
        "description": "Zero or one (lazy)",
        "example": "\\d??",
        "category": "Quantifiers"
      },
      {
        "pattern": "(abc)",
        "description": "Capturing group",
        "example": "(\\d+)-(\\d+)",
        "category": "Groups & References"
      },
      {
        "pattern": "(?:abc)",
        "description": "Non-capturing group",
        "example": "(?:ab|cd)+",
        "category": "Groups & References"
      },
      {
        "pattern": "\\1",
        "description": "Backreference to group 1",
        "example": "(\\w+)\\s\\1",
        "category": "Groups & References"
      },
      {
        "pattern": "(?<name>abc)",
        "description": "Named capturing group",
        "example": "(?<year>\\d{4})",
        "category": "Groups & References"
      },
      {
        "pattern": "\\k<name>",
        "description": "Named backreference",
        "example": "\\k<year>",
        "category": "Groups & References"
      },
      {
        "pattern": "(a|b)",
        "description": "Alternation (a or b)",
        "example": "(cat|dog)",
        "category": "Groups & References"
      },
      {
        "pattern": "(?=abc)",
        "description": "Positive lookahead",
        "example": "\\w+(?=ing)",
        "category": "Lookahead & Lookbehind"
      },
      {
        "pattern": "(?!abc)",
        "description": "Negative lookahead",
        "example": "\\d+(?!px)",
        "category": "Lookahead & Lookbehind"
      },
      {
        "pattern": "(?<=abc)",
        "description": "Positive lookbehind",
        "example": "(?<=\\$)\\d+",
        "category": "Lookahead & Lookbehind"
      },
      {
        "pattern": "(?<!abc)",
        "description": "Negative lookbehind",
        "example": "(?<!\\d)\\d+",
        "category": "Lookahead & Lookbehind"
      },
      {
        "pattern": "g",
        "description": "Global — match all occurrences",
        "example": "/pattern/g",
        "category": "Flags"
      },
      {
        "pattern": "i",
        "description": "Case-insensitive matching",
        "example": "/hello/i",
        "category": "Flags"
      },
      {
        "pattern": "m",
        "description": "Multiline — ^ and $ match line boundaries",
        "example": "/^line/m",
        "category": "Flags"
      },
      {
        "pattern": "s",
        "description": "Dotall — dot matches newlines",
        "example": "/a.b/s",
        "category": "Flags"
      },
      {
        "pattern": "u",
        "description": "Unicode — enable Unicode matching",
        "example": "/\\p{L}/u",
        "category": "Flags"
      },
      {
        "pattern": "y",
        "description": "Sticky — match at lastIndex position",
        "example": "/\\d+/y",
        "category": "Flags"
      },
      {
        "pattern": "^[\\w.-]+@[\\w.-]+\\.\\w{2,}$",
        "description": "Email address",
        "example": "user@example.com",
        "category": "Common Patterns"
      },
      {
        "pattern": "^https?://[\\w.-]+(?:/[\\w./-]*)?$",
        "description": "URL",
        "example": "https://example.com/path",
        "category": "Common Patterns"
      },
      {
        "pattern": "^\\d{1,3}(\\.\\d{1,3}){3}$",
        "description": "IPv4 address",
        "example": "192.168.1.1",
        "category": "Common Patterns"
      },
      {
        "pattern": "^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$",
        "description": "Hex color code",
        "example": "#ff6600",
        "category": "Common Patterns"
      },
      {
        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
        "description": "Date (YYYY-MM-DD)",
        "example": "2026-04-10",
        "category": "Common Patterns"
      },
      {
        "pattern": "^\\+?[\\d\\s()-]{7,15}$",
        "description": "Phone number",
        "example": "+1 (555) 123-4567",
        "category": "Common Patterns"
      },
      {
        "pattern": "^-?\\d+(\\.\\d+)?$",
        "description": "Number (integer or decimal)",
        "example": "-42.5",
        "category": "Common Patterns"
      },
      {
        "pattern": "^(?=.*[A-Z])(?=.*[a-z])(?=.*\\d).{8,}$",
        "description": "Strong password (8+ chars)",
        "example": "Passw0rd!",
        "category": "Common Patterns"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}