Kvalley's RegEx Creator

Regular Expression
String to Check
Create Variant Expression	Exclude Actual Word Whitespace:

Symbol	Function
^	Only match the beginning of a string. "^A" matches first "A" in "An A+ for Anita."
$	Only match the ending of a string. "t$" matches the last "t" in "A cat in the hat"
\b	Matches any word boundary. "ly\b" matches "ly" in "possibly tomorrow."
\B	Matches any non-word boundary.

Symbol	Function
Alphanumeric	Matches alphabetical and numerical characters literally.
\n	Matches a new line.
\f	Matches a form feed.
\r	Matches carriage return.
\t	Matches horizontal tab.
\v	Matches vertical tab.
\?	Matches ?
\*	Matches *
\+	Matches +
\.	Matches .
\\|	Matches \|
\{	Matches {
\}	Matches }
\\	Matches \
\[	Matches [
\]	Matches ]
\(	Matches (
\)	Matches )
\xxx	Matches the ASCII character expressed by the octal number xxx. "\50" matches "(" or chr (40).
\xdd	Matches the ASCII character expressed by the hex number dd. "\x28" matches "(" or chr (40).
\uxxxx	Matches the ASCII character expressed by the UNICODE xxxx. "\u00A3" matches "£".

Character Classes

Symbol	Function
[xyz]	Match any one character enclosed in the character set. "[a-e]" matches "b" in "basketball".
[^xyz]	Match any one character not enclosed in the character set. "[^a-e]" matches "s" in "basketball".
.	Match any character except \n.
\w	Match any word character. Equivalent to [a-zA-Z_0-9].
\W	Match any non-word character. Equivalent to [^a-zA-Z_0-9].
\d	Match any digit. Equivalent to [0-9].
\D	Match any non-digit. Equivalent to [^0-9].
\s	Match any space character. Equivalent to [ \t\r\n\v\f].
\S	Match any non-space character. Equivalent to [^ \t\r\n\v\f].

Repetition

Symbol	Function
{x}	Match exactly x occurrences of a regular expression. "\d{5}" matches 5 digits.
{x,}	Match x or more occurrences of a regular expression. "\s{2,}" matches at least 2 space characters.
{x,y}	Matches x to y number of occurrences of a regular expression. "\d{2,3}" matches at least 2 but no more than 3 digits.
?	Match zero or one occurrences. Equivalent to {0,1}. "a\s?b" matches "ab" or "a b".
*	Match zero or more occurrences. Equivalent to {0,}.
+	Match one or more occurrences. Equivalent to {1,}.

Alternation & Grouping

Symbol	Function
()	Grouping a clause to create a clause. May be nested. "(ab)?(c)" matches "abc" or "c".
\|	Alternation combines clauses into one regular expression and then matches any of the individual clauses. "(ab)\|(cd)\|(ef)" matches "ab" or "cd" or "ef".

BackReferences

Symbol	Function
()\n	Matches a clause as numbered by the left parenthesis. "(\w+)\s+\1" matches any word that occurs twice in a row, such as "hubba hubba."
(?!)	Negative Lookahead. "^(?!ver)v" matches any word starting with"v" except if the word starts with "ver".