Function extractTag

src/utils/messages.ts:633–687

(html: string, tagName: string)

}

export function extractTag(html: string, tagName: string): string | null {
  if (!html.trim() || !tagName.trim()) {
    return null
  }

  const escapedTag = escapeRegExp(tagName)

  // Create regex pattern that handles:
  // 1. Self-closing tags
  // 2. Tags with attributes
  // 3. Nested tags of the same type
  // 4. Multiline content
  const pattern = new RegExp(
    `<${escapedTag}(?:\\s+[^>]*)?>` + // Opening tag with optional attributes
      '([\\s\\S]*?)' + // Content (non-greedy match)
      `<\\/${escapedTag}>`, // Closing tag
    'gi',
  )

  let match
  let depth = 0
  let lastIndex = 0
  const openingTag = new RegExp(`<${escapedTag}(?:\\s+[^>]*?)?>`, 'gi')
  const closingTag = new RegExp(`<\\/${escapedTag}>`, 'gi')

  while ((match = pattern.exec(html)) !== null) {
    // Check for nested tags
    const content = match[1]
    const beforeMatch = html.slice(lastIndex, match.index)

    // Reset depth counter
    depth = 0

    // Count opening tags before this match
    openingTag.lastIndex = 0
    while (openingTag.exec(beforeMatch) !== null) {
      depth++
    }

    // Count closing tags before this match
    closingTag.lastIndex = 0
    while (closingTag.exec(beforeMatch) !== null) {
      depth--
    }

    // Only include content if we're at the correct nesting level
    if (depth === 0 && content) {
      return content
    }

    lastIndex = match.index + match[0].length
  }

  return null
}

export function isNotEmptyMessage(message: Message): boolean {
  if (