I will create a regex pattern to match all the email addresses, phone numbers, and identifiers. For email addresses, I will use the pattern '[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}' to match the standard email format. For phone numbers, I will use the pattern '\+?\d{1,4}?\s?\(?\d{1,4}\)?[-. ]?\d{1,4}[-. ]?\d{1,4}[-. ]?\d{1,4}(?:x|xtn|extension)?\s?\d{1,5}?' to match various phone number formats. For identifiers, I will use the pattern '[a-zA-Z0-9!#$%&'*+/=?^`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^`{|}~-]+)*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*' to match the standard email format, but I will also include characters that are not typically allowed in email addresses to match the identifiers. I will combine these patterns using the '|' operator to create a single regex pattern that matches all the target items.