Find Text with Regular Expressions

On selecting Use in the Find and Replace window, you will be able to choose either Regular Expressions or Wildcards:

By choosing Regular Expressions, you unlock the following set of expressions in the Expression Builder:

Expression	Syntax	Description
Any single character	.	Matches any single character except a line break.
Zero or more	*	Matches zero or more occurrences of the preceding expression, making all possible matches.
One or more	+	Matches at least one occurrence of the preceding expression.
Beginning of line	^	Anchors the match string to the beginning of a line.
End of line	$	Anchors the match string to the end of a line.
Beginning of word	<	Matches only when a word begins at this point in the text.
End of word	>	Matches only when a word ends at this point in the text.
Any one character in the set	[]	Matches any one of the characters within the []. To specify a range of characters, list the starting and ending character separated by a dash (-), as in [a-z].
Any one character not in the set	[^...]	Matches any character not in the set of characters following the ^.
Or	|	Matches either the expression before or the one after the OR symbol. Mostly used within a group.
Escape Special Character	\	Matches the character that follows the backslash as a literal. This allows you to find the characters used in regular expression notation, such as { and ^.
Tag Expression	{}	Matches text tagged with the enclosed expression.
SQL identifier	:i	Matches the expression ([a-zA-Z_$][a-zA-Z0-9_$])*.
Quoted string	:q	Matches the expression (("[^"]*")|('[^']*')).
Space or Tab	:b	Matches either space or tab characters.
Integer	:z	Matches the expression ([0-9]+).