character	illustrate
\	Mark the next character as a special character, text, backreference, or octal escape character. For example, "n" matches the character "n". "\n" matches the newline character. The sequence "\\" matches "\", "\(" matches"(".
^	Matches the location where the input string begins. If setRegExpThe object'sMultilineattribute, ^ will also match the position after "\n" or "\r".
$	Match the end of the input string. If setRegExpThe object'sMultilineProperties, $ will also match the position before "\n" or "\r".
*	Matches the preceding character or subexpression zero or multiple times. For example, zo* matches "z" and "zoo". * is equivalent to {0,}.
+	Matches the preceding character or subexpression one or more times. For example, "zo+" matches "zo" and "zoo" but does not match "z". + is equivalent to {1,}.
?	Matches the preceding character or subexpression zero or once. For example, "do(es)?" matches "do" in "do" or "does". ? Equivalent to {0,1}
{n}	n Yes, non-negative integers. Just matchnSecond-rate. For example, "o{2}" does not match "o" in "Bob", but matches two "o" in "food".
{n,}	n Yes, non-negative integers. At least matchn Second-rate. For example, "o{2,}" does not match "o" in "Bob" and all os in "fooooood". 'o{1,}' is equivalent to 'o+'. 'o{0,}' is equivalent to 'o*'.
{n,m}	mandnYes, non-negative integers, wheren <= m. At least matchnTime, at most matchmSecond-rate. For example, "o{1,3}" matches the first three os in "fooooood". 'o{0,1}' is equivalent to 'o?'. Note: You cannot insert spaces between commas and numbers.
?	When this character is followed by any other qualifier (*, +,?, {n}、{n,}、{n,m}) After that, the matching pattern is "non-greedy". The "non-greedy" pattern matches the searched, shortest string as possible, while the default "grey" pattern matches the searched, longest string. For example, in the string "oooo", "o+?" matches only a single "o", and "o+" matches all "o".
.	Match any single character except "\n". To match any character including "\n", use a pattern such as "[\s\S]".
(pattern)	matchpatternand capture the matching subexpression. Available$0...$9Attributes retrieve captured matches from the result Matches collection. To match the bracket character ( ), use "\(" or "\)".
(?:pattern)	matchpatternBut the subexpression of the match is not captured, i.e. it is a non-capture match and does not store the match for later use. This is useful for combining mode components with the "or" character (|). For example, the expression "industr(?:y|ies)" is more economical than "industry|industries".
(?=pattern)	The subexpression that performs a forward prediction prior search, which matches the expressionpatternstring at the starting point of the string. It is a non-capture match, i.e. it cannot capture matches for later use. For example, "Windows (?=95|98|NT|2000)" matches "Windows" in "Windows 2000" and does not match "Windows" in "Windows 3.1". Prediction does not occupy characters, that is, after a match occurs, the next match's search follows the previous match, rather than after the character that makes up the prediction.
(?!pattern)	The subexpression that performs a reverse prediction predecessor search, which matches are not in the matchpatternThe search string for the starting point of the string. It is a non-capture match, i.e. it cannot capture matches for later use. For example, "Windows (?!95|98|NT|2000)" matches "Windows" in "Windows 3.1" and does not match "Windows" in "Windows 2000". Prediction does not occupy characters, that is, after a match occurs, the next match's search follows the previous match, rather than after the character that makes up the prediction.
x|y	matchxory. For example, "z|food" matches "z" or "food". "(z|f)ood" matches "zood" or "food".
[xyz]	Character set. Match any character contained. For example, "[abc]" matches "a" in "plain".
[^xyz]	Reverse character set. Match any characters not included. For example, "[^abc]" matches "p" in "plain".
[a-z]	Character range. Match any character in the specified range. For example, "[a-z]" matches any lowercase letters in the range "a" to "z".
[^a-z]	Reverse range characters. Match any characters that are not within the specified range. For example, "[^a-z]" matches any character that is not in the range of "a" to "z".
\b	Match a word boundary, that is, the position between the word and the space. For example, "er\b" matches "er" in "never", but does not match "er" in "verb".
\B	Non-word boundary matching. "er\B" matches "er" in "verb", but not "er" in "never".
\cx	Match byxThe control character indicated. For example, \cM matches a Control-M or carriage return.xThe value of , must be between A-Z or a-z. If this is not the case, then c is assumed to be the "c" character itself.
\d	Number character matching. Equivalent to [0-9].
\D	Non-numeric character matching. Equivalent to [^0-9].
\f	Page change matching. Equivalent to \x0c and \cL.
\n	Line breaks match. Equivalent to \x0a and \cJ.
\r	Match a carriage return character. Equivalent to \x0d and \cM.
\s	Match any whitespace characters, including spaces, tabs, page breaks, etc. Equivalent to [ \f\n\r\t\v].
\S	Match any non-whitespace characters. Equivalent to [^ \f\n\r\t\v].
\t	Tab matching. Equivalent to \x09 and \cI.
\v	Vertical tab matching. Equivalent to \x0b and \cK.
\w	Match any character in word class, including underscores. Equivalent to "[A-Za-z0-9_]".
\W	Any non-character matching. Equivalent to "[^A-Za-z0-9_]".
\xn	matchn, herenis a hexadecimal escape code. The hexadecimal escape code must be exactly two digits long. For example, "\x41" matches "A". "\x041" is equivalent to "\x04"&"1". Allows the use of ASCII code in regular expressions.
\num	matchnum, herenumis a positive integer. to capture the backreference of the match. For example, "(.)\1" matches two consecutive identical characters.
\n	Identifies an octal escape code or backreference. if \nAt least there isna capture subexpression, thennis a backreference. Otherwise, ifnIt is an octal number (0-7), thennIt is an octal escape code.
\nm	Identifies an octal escape code or backreference. if \nmAt least there isnma capture subexpression, thennmis a backreference. if \nmAt least there isnA capture, thennIt's a backreference, followed bym. If the previous conditions do not exist, thenn andmWhen it is an octal number (0-7), \nmMatch octal escape codenm。
\nml	whennis an octal number (0-3),mandlWhen it is an octal number (0-7), matches the octal escape codenml。
\un	matchn,innIt is a Unicode character represented by four hexadecimal numbers. For example, \u00A9 matches the copyright symbol (©).