Board Thread:Support Requests - Getting Technical/@comment-25295528-20160719210601/@comment-24551580-20160719213132

From Wikipedia:
 * Regex – If checked indicates that the find and replace expression is a regular expression.
 * Multiline – If checked, this indicates to AWB that the regex characters "^" and "$" ought to match at the beginning and the end of lines respectively, not just the beginning and end of the entire page. In some programming contexts this is referred to as treating the page as a multiline string.
 * Singleline – If checked, this indicates to AWB that the regex character "." matches every character. Instead of every character except "\n". In some programming contexts this is referred to as treating the page as a singleline string. The "Multiline" and "Singleline" options separately affect how different special characters are interpreted and are not mutually exclusive.

Regex (or REGular EXpression): a sequence of symbols and characters expressing a string or pattern to be searched for within a longer piece of text.