Newline preservation help function for wpautop().

Performs a deep string replace operation to ensure the values in $search are no longer present.

Callback to add a base URL to relative links in passed content.

Callback to add a target attribute to all links in passed content.

Callback to convert email address match to HTML A element.

Callback to convert URI match to HTML A element.

Callback to convert URL match to HTML A element.

Internal helper function to sanitize a string from user input or from the database.

Breaks a string into chunks by splitting at whitespace characters.

Returns arrays of emoji data.