Regular Expressions

Description
^Matches the beginning of line
$Matches the end of line
.Mathes any character
\sMatches whitespace; equivalent to [\t\n\r\f\v]
\SMatches any NON-Whitespace; equivalent to [^\t\n\r\f\v]
*Zero or more time; Repeats a character
*?Zero or more times; NON-GREEDY; Repeats a character
+One or More times; Repeats a character
+?One or More times; NON-GREEDY; Repeats a character
[aeiou]Matches a single character in the listed set
[^XYZ]Matches a single character NOT in the listed set
[a-z0-9]A set of character or an include range
(Indicates where the string extraction starts
)Indicates where the string extraction ends
a|bmatches either a or b, a and b are string
\Escape character for special characters (\t, \n, \b)
\bMatches word boundary
\dMatches single digit; equivalent to [0-9]
\wAlphanumeric character; [a-zA-Z0-9_]
\WNON-Alphanumeric character; [^a-zA-Z0-9_]
?Matches zero or One occurances
{n}Exactly n repetitions, n>=0
{n,}Atleast n repeatitions
{,n}Atmost n repeatitions
{m,n}Atleast m times and atmost n repeatitions