Common Front-end regular expressions

Expression Complete Set

Character	Description
\	Mark the next character as a special character, a literal character, or a backward reference, or an octal escape character. For example,n"Matching character"n". "\nMatch a line break. Serial"\\"Match"\"And"\("Matches"(".
^	Matches the start position of the input string. If the multiline attribute of the Regexp object is set, ^ matches"\n"Or"\r.
$	Matches the end position of the input string. If the multiline attribute of the Regexp object is set, $ also matches"\n"Or"\r.
*	Matches the previous subexpression zero or multiple times. For example, Zo * can match"z"And"zoo". * Is equivalent to {0 ,}.
+	Match the previous subexpression once or multiple times. For example,zo+"Can match"zo"And"zoo", But cannot match"z". + Is equivalent to {1 ,}.
?	Match the previous subexpression zero or once. For example,do(es)?"Can match"does"Or"does"In"do".? It is equivalent to {0, 1 }.
{N}	N is a non-negative integer. Match n times. For example,o{2}"Cannot match"Bob"In"o", But can match"food.
{N ,}	N is a non-negative integer. Match at least N times. For example,o{2,}"Cannot match"Bob"In"o", But can match"foooood. "o{1,}"Is equivalent to"o+". "o{0,}"Is equivalent to"o*".
{N, m}	Both m and n are non-negative integers, where n <= m. Match at least N times and at most m times. For example,o{1,3}"Will match"fooooood. "o{0,1}"Is equivalent to"o?". Note that there must be no space between a comma and two numbers.
?	When this character is followed by any other delimiter (*, + ,?, The matching mode after {n}, {n ,}, {n, m}) is not greedy. The non-Greedy mode matches as few searched strings as possible, while the default greedy mode matches as many searched strings as possible. For example,oooo","o+?"Will match a single"o", And"o+"Will match all"o".
.	Match the\n. To match the\n", Please use any character like"(.|\n).
(Pattern)	Match pattern and obtain this match. The obtained match can be obtained from the generated matches set. The submatches set is used in VBScript, and $0… is used in JScript... $9 attribute. To match the parentheses, use the"\("Or"\)".
(? : Pattern)	Matches pattern but does not get the matching result. That is to say, this is a non-get match and is not stored for future use. This is in use or the character"(|)It is very useful to combine all parts of a pattern. For example,industr(?:y|ies)"Is a comparison"industry|industries"A simpler expression.
(? = Pattern)	Forward validation pre-query: matches the search string at the beginning of any string that matches pattern. This is a non-get match, that is, the match does not need to be obtained for future use. For example,Windows(?=95|98|NT|2000)"Can match"Windows2000"In"Windows", But cannot match"Windows3.1"In"Windows". Pre-query does not consume characters, that is, after a match occurs, the next matching search starts immediately after the last match, instead of starting after the pre-query characters.
(?! Pattern)	Forward negative pre-query: matches the search string at the beginning of any string that does not match pattern. This is a non-get match, that is, the match does not need to be obtained for future use. For example,Windows(?!95|98|NT|2000)"Can match"Windows3.1"In"Windows", But cannot match"Windows2000"In"Windows". Pre-query does not consume characters. That is to say, after a match occurs, the next matching search starts immediately after the last match, instead of starting after the pre-query characters.
(? <= Pattern)	The reverse direction is certainly precheck, which is similar to the forward positive direction. For example,(?<=95|98|NT|2000)Windows"Can match"2000Windows"In"Windows", But cannot match"3.1Windows"In"Windows".
(? <! Pattern)	Reverse negative pre-query, similar to forward negative pre-query, is in the opposite direction. For example,(?<!95|98|NT|2000)Windows"Can match"3.1Windows"In"Windows", But cannot match"2000Windows"In"Windows".
X | y	Match X or Y. For example,z|food"Can match"z"Or"food". "(z|f)ood"Matches"zood"Or"food".
[Xyz]	Character Set combination. Match any character in it. For example,[abc]"Can match"plain"In"a".
[^ XYZ]	Negative value character set combination. Match any character not included. For example,[^abc]"Can match"plain"In"p".
[A-Z]	Character range. Matches any character in the specified range. For example,[a-z]"Can match"a"To"zAny lowercase letter in the range.
[^ A-Z]	Negative character range. Matches any character that is not within the specified range. For example,[^a-z]"Can match anya"To"zAny character in the range.
\ B	Match A Word boundary, that is, the position between a word and a space. For example,er\b"Can match"never"In"er", But cannot match"verb"In"er".
\ B	Match non-word boundary. "er\B"Can match"verb"In"er", But cannot match"never"In"er".
\ CX	Match the control characters specified by X. For example, \ cm matches a control-M or carriage return character. The value of X must be either a A-Z or a-Z. Otherwise, C is regarded as an original"c"Character.
\ D	Match a numeric character. It is equivalent to [0-9].
\ D	Match a non-numeric character. It is equivalent to [^ 0-9].
\ F	Match a form feed. It is equivalent to \ x0c and \ Cl.
\ N	Match A linefeed. It is equivalent to \ x0a and \ CJ.
\ R	Match a carriage return. It is equivalent to \ x0d and \ cm.
\ S	Matches any blank characters, including spaces, tabs, and page breaks. It is equivalent to [\ f \ n \ r \ t \ v].
\ S	Match any non-blank characters. It is equivalent to [^ \ f \ n \ r \ t \ v].
\ T	Match a tab. It is equivalent to \ x09 and \ CI.
\ V	Match a vertical tab. It is equivalent to \ x0b and \ ck.
\ W	Match any word characters that contain underscores. It is equivalent to[A-Za-z0-9_]".
\ W	Match any non-word characters. It is equivalent to[^A-Za-z0-9_]".
\ XN	Match n, where N is the hexadecimal escape value. The hexadecimal escape value must be determined by the length of two numbers. For example,\x41"Match"A". "\x041"Is equivalent to"\x04&1". The regular expression can use ASCII encoding ..
\ Num	Matches num, where num is a positive integer. References to the obtained matching. For example,(.)\1"Matches two consecutive identical characters.
\ N	Identifies an octal escape value or a backward reference. If at least N subexpressions are obtained before \ n, n is backward referenced. Otherwise, if n is an octal digit (0-7), n is an octal escape value.
\ Nm	Identifies an octal escape value or a backward reference. If at least one child expression is obtained before \ nm, the NM is backward referenced. If at least N records are obtained before \ nm, n is a backward reference followed by text M. If none of the preceding conditions are met, if n and m are Octal numbers (0-7), \ nm matches the octal escape value nm.
\ NML	If n is an octal number (0-3) and M and l are Octal numbers (0-7), the octal escape value NML is matched.
\ UN	Match n, where n is a Unicode character represented by four hexadecimal numbers. For example, \ u00a9 matches the copyright symbol ().

 

Common Regular Expressions

 

User Name	/^ [A-z0-9 _-] {} $/
Password	/^ [A-z0-9 _-] {6, 18} $/
Hexadecimal value	/^ #? ([A-f0-9] {6} | [a-f0-9] {3}) $/
Email	/^ ([A-z0-9 _\. -] +) @ ([\ da-Z \. -] + )\. ([A-Z \.] {2, 6}) $/ /^ [A-Z \ D] + (\. [A-Z \ D] +) * @ ([\ da-Z] (-[\ da-Z])?) + (\. {1, 2} [A-Z] +) + $/
URL	/^ (HTTPS? :\/\/)? ([\ Da-Z \. -] + )\. ([A-Z \.] {2, 6}) ([\/\ W \. -] *) * \/? $/
IP address	/(2 [0-4] \ d | 25 [0-5] | [01]? \ D ?) \.) {3} (2 [0-4] \ d | 25 [0-5] | [01]? \ D ?) / /^ (? :(? : 25 [0-5] | 2 [0-4] [0-9] | [01]? [0-9] [0-9]?) \.) {3 }(? : 25 [0-5] | 2 [0-4] [0-9] | [01]? [0-9] [0-9]?) $/
HTML Tag	/^ <([A-Z] +) ([^ <] + )*(? :> (. *) <\/\ 1> | \ s + \/>) $/
Delete Code \ comments	(? <! HTTP: | \ s) //. * $
Range of Chinese Characters in Unicode encoding	/^ [\ U2e80-\ u9fff] + $/