This refers to the first through ninth (\1 to \9) tagged region when replacing. These tags can be used within the current regular expression or in the replacement string in a search/replace.
These tag can be access using the syntax \1 for the first tag, \2 for the second, and \3 \4. To match all characters including new lines you can use \s\S. Note: That this means "." will also match \r which might cause some confusion when you are editing a file with both \r and \n.
Matches any character except new line (\n). Note: Multi-line expressions (involving \n, \r, etc) are not yet supported. Regular Expressions allow complicated and flexible search/replace using a specific syntax. _NOTE: For older versions of PN the tagged expressions start \( and end \) and there are no non-capture groups nor the backslash groups.
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