Fetches a complete web page with pagination support. Retrieves content from websites with bot-detection avoidance. For best performance, start with 'basic' mode (fastest), then only escalate to 'stealth' or 'max-stealth' modes if basic mode fails. Content is returned as 'METADATA: {json}\n\n[content]' where metadata includes length information and truncation status.

Args:
    url: URL to fetch
    mode: Fetching mode (basic, stealth, or max-stealth)
    format: Output format (html or markdown)
    max_length: Maximum number of characters to return.
    start_index: On return output starting at this character index, useful if a previous fetch was truncated and more content is required.

Extracts content matching regex patterns from web pages. Retrieves specific content from websites with bot-detection avoidance. For best performance, start with 'basic' mode (fastest), then only escalate to 'stealth' or 'max-stealth' modes if basic mode fails. Returns matched content as 'METADATA: {json}\n\n[content]' where metadata includes match statistics and truncation information. Each matched content chunk is delimited with '॥๛॥' and prefixed with '[Position: start-end]' indicating its byte position in the original document, allowing targeted follow-up requests with s-fetch-page using specific start_index values.

Args:
    url: URL to fetch
    search_pattern: Regular expression pattern to search for in the content
    mode: Fetching mode (basic, stealth, or max-stealth)
    format: Output format (html or markdown)
    max_length: Maximum number of characters to return.
    context_chars: Number of characters to include before and after each match