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| Escape Sequence | Description |
| \b | Specifies a boundary defined by a transition from an
alphanumeric character to a nonalphanumeric character, or from a
nonalphanumeric character to an alphanumeric character.
For example, the string " Big" contains boundary defined by the
space (nonalphanumeric character) and the "B" (alphanumeric character).
The following example uses the \b escape sequence in a regular
expression to locate the string "Big" at the end of the search string
and not the fragment "big" inside the word "ambiguous".
reFindNoCase("\bBig\b", "Don't be ambiguous about Big.")
<!--- The value of IndexOfOccurrence is 26 --->When used inside of a character set (e.g. [\b]), it specifies a backspace |
| \B | Specifies a boundary defined by no transition of character type. For example, two alphanumeric character in a row or two nonalphanumeric character in a row; opposite of \b. |
| \A | Specifies a beginning of string anchor, much like the ^ special character. However, unlike ^, you cannot combine \A with (?m) to specify the start of newlines in the search string. |
| \Z | Specifies an end of string anchor, much like the $ special character. However, unlike $, you cannot combine \Z with (?m) to specify the end of newlines in the search string. |
| \n | Newline character |
| \r | Carriage return |
| \t | Tab |
| \f | Form feed |
| \d | Any digit, similar to [0-9] |
| \D | Any nondigit character, similar to [^0-9] |
| \w | Any alphanumeric character, similar to [[:alnum:]] |
| \W | Any nonalphanumeric character, similar to [^[:alnum:]] |
| \s | Any whitespace character including tab, space, newline, carriage return, and form feed. Similar to [ \t\n\r\f]. |
| \S | Any nonwhitespace character, similar to [^ \t\n\r\f] |
| \xdd | A hexadecimal representation of character, where d is a hexadecimal digit |
| \ddd | An octal representation of a character, where d is an octal digit, in the form \000 to \377 |
