JavaScript Classic instances-Regular expressions

1] Regular characters commonly used character

special characters commonly used in regular expressions

Character	The	Example
^	Start of Match input	/^this/matches "This is ..."
$	Match end of input	/end$/matches "This is the end"
*	Match 0 or more times	/se*/matches "Seeee", also matches "se"
?	Match 0 or one time	/ap?/matches "Apple" and "and"
+	Match one or more times	/ap+/matches "Apple" but does not match "and"
N	Strictly Match n times	/ap{2}/matches "Apple" but does not match "Apie"
{N,}	Match n times or N extra times	/ap{2,}/matches all p in "apple" and "appple", but does not match "Apie"
{N, m}	Matches at least n times, up to M times	/ap{2,4}/matches 4 p in "Apppppple"
.	Any character other than line break	/a.e/matches "ape" and "Axe"
[...]	Any of the characters in square brackets	/a[px]e/matches "ape" and "axe", but does not match "ale"
[^...]	Any character except the character in square brackets	/a[px]e/matches ale, but does not match ape, or axe
\b	Words on the border	\bno\ matches the first "no" in "none"
\b	A word on a non-boundary	\bno\ matches the second "no" in "none"
\d	The number from 0-9 is equivalent to [0-9]	/\d{3}/matches "123" in "123"
\d	Any non-numeric character is equivalent to [^0-9]	/\d{2,4}/matches ' now ' in ' Now ' in 123
\w	Match word characters (letters, numbers, underscores) equivalent to [a-za-z0-9_]	/\w/matches "J" in JavaScript
\w	Match non-word characters (not letters, numbers, underscores)	/\w/matches "%" in "100%"
\ n	Match a line break
\s	A single white-space character
\s	A single, non-whitespace character
\ t	A tab
(x)	Capturing parentheses	Remember the characters that match

2] As with other objects, there are direct quantities and regexp of objects.

1 // Regular Objects 2 var New REGEXP ("A\s+b"); 3 // Regular Direct Volume 4 /a\s+b/5// final match a B, or a   B, but does not match AB

(not to be continued ...)

JavaScript Classic instances-Regular expressions