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Regular Expressions may optionally be used when searching. See Searching and Text Operations for more information about searches.
This is the detailed information about how to use regular expressions as gleaned from the Scintilla documentation. There are two versions, a complex one first, and a simpler one afterwards.
Regular Expressions:  char matches itself, unless it is a special character (metachar): . \ [ ] * + ^ $  . matches any character.  \ matches the character following it, except when followed by a left or right round bracket, a digit 1 to 9 or a left or right angle bracket. (see ,  and ) It is used as an escape character for all other meta-characters, and itself. When used in a set (), it is treated as an ordinary character.  [set] matches one of the characters in the set. If the first character in the set is "^", it matches a character NOT in the set, i.e. complements the set. A shorthand S-E is used to specify a set of characters S upto E, inclusive. The special characters "]" and "-" have no special meaning if they appear as the first chars in the set. examples: match: [a-z] any lowercase alpha [^]-] any char except ] and - [^A-Z] any char except uppercase alpha [a-zA-Z] any alpha  * any regular expression form  to , followed by closure char (*) matches zero or more matches of that form.  + same as , except it matches one or more.  a regular expression in the form  to , enclosed as \(form\) matches what form matches. The enclosure creates a set of tags, used for  and for pattern substution. The tagged forms are numbered starting from 1.  a \ followed by a digit 1 to 9 matches whatever a previously tagged regular expression () matched.  \< a regular expression starting with a \< construct \> and/or ending with a \> construct, restricts the pattern matching to the beginning of a word, and/or the end of a word. A word is defined to be a character string beginning and/or ending with the characters A-Z a-z 0-9 and _. It must also be preceded and/or followed by any character outside those mentioned.  a composite regular expression xy where x and y are in the form  to  matches the longest match of x followed by a match for y.  ^ a regular expression starting with a ^ character $ and/or ending with a $ character, restricts the pattern matching to the beginning of the line, or the end of line. [anchors] Elsewhere in the pattern, ^ and $ are treated as ordinary characters. Examples: pattern: foo*.* compile: CHR f CHR o CLO CHR o END CLO ANY END END matches: fo foo fooo foobar fobar foxx ... pattern: fo[ob]a[rz] compile: CHR f CHR o CCL bitset CHR a CCL bitset END matches: fobar fooar fobaz fooaz pattern: foo\\+ compile: CHR f CHR o CHR o CHR \ CLO CHR \ END END matches: foo\ foo\\ foo\\\ ... pattern: \(foo\)[1-3]\1 (same as foo[1-3]foo) compile: BOT 1 CHR f CHR o CHR o EOT 1 CCL bitset REF 1 END matches: foo1foo foo2foo foo3foo pattern: \(fo.*\)-\1 compile: BOT 1 CHR f CHR o CLO ANY END EOT 1 CHR - REF 1 END matches: foo-foo fo-fo fob-fob foobar-foobar ...
The on-line Scintilla documentation has a somewhat less wordy spin on it:
Matches any character
This marks the start of a region for tagging a match.
This marks the end of a tagged region.
n is 1 through 9 refers to the first through ninth tagged region when replacing. For example if the search string was
Fred\([1-9]\)XXX and the replace string was
Sam\1YYY applied to
Fred2XXX this would generate
This matches the start of a word using Scintilla's definitions of words.
This matches the end of a word using Scintilla's definition of words.
This allows you to use a character x that would otherwise have a special meaning. For example, \[ would be interpreted as [ and not as the start of a character set.
This indicates a set of characters, for example [abc] means any of the characters a, b or c. You can also use ranges, for example [a-z] for any lower case character.
The complement of the characters in the set. For example, [^A-Za-z] means any character except an alphabetic character.
This matches the start of a line (unless used inside a set, see above).
This matches the end of a line.
This matches 0 or more times. For example
Saaam and so on.
This matches 1 or more times. For example
Saaam and so on.