Complete set of expressions
| character | describe |
|---|---|
| \ | Marks the next character as a special character, or a literal character, or a backreference, or an octal escape. For example, " n" matches the character " n". " \n" matches a newline character. The serial " \\" matches " \" and " \(" matches " (". |
| ^ | Matches the starting position of the input string. If the Multiline property of the RegExp object is set, ^ also matches the position after " \n" or " \r". |
| $ | Matches the end of the input string. If the Multiline property of the RegExp object is set, $ also matches the position before " \n" or " \r". |
| * | Matches the preceding subexpression zero or more times. For example, zo* can match " z" as well as " zoo". * Equivalent to {0,}. |
| + | Matches the preceding subexpression one or more times. For example, " zo+" can match " zo" and " zoo", but not " z". + is equivalent to {1,}. |
| ? | Matches the preceding subexpression zero or one time. For example, " do(es)?" can match " " in " does" or " ". ? is equivalent to {0,1}.doesdo |
| {n} | n is a non-negative integer. Match a certain number of n times. For example, " o{2}" cannot match " Bob" in " o", but can match foodtwo o's in " ". |
| {n,} | n is a non-negative integer. Match at least n times. For example, " o{2,}" cannot match " Bob" in " o", but can match fooooodall o's in " ". " 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 foooooodthe first three o's in " ". " o{0,1}" is equivalent to " o?". Note that there can be no spaces between the comma and the two numbers. |
| ? | When the character immediately follows any one of the other qualifiers (*,+,?, { n }, { n ,}, { n , m }), the matching pattern is non-greedy. The non-greedy mode matches as little of the searched string as possible, while the default greedy mode matches as much of the searched string as possible. For example, for the string " oooo", " o+?" will match a single " o", and " o+" will match all " o". |
| . | Matches \nany single character except " ". To match \nany character including " ", use (.|\n)a pattern like " ". |
| (pattern) | Match pattern and get that match. The retrieved matches can be obtained from the resulting Matches collection, using the SubMatches collection in VBScript and the $0…$9 properties in JScript. To match parenthesis characters, use " \(" or " \)". |
| (?:pattern) | Matches the pattern but does not get the result of the match, that is, it is a non-getting match and is not stored for later use. This is useful when using the or character " (|)" to combine parts of a pattern. For example, " industr(?:y|ies)" is a industry|industriesmore abbreviated expression than " ". |
| (?=pattern) | Positive positive lookahead matches the lookup string at the beginning of any string matching pattern. This is a non-acquisition match, that is, the match does not need to be acquired for later use. For example, " Windows(?=95|98|NT|2000)" can match " Windows2000" in " Windows", but not " Windows3.1" in " Windows". Lookahead consumes no characters, that is, after a match occurs, the search for the next match begins immediately after the last match, not after the character containing the lookahead. |
| (?!pattern) | Forward negative lookahead, which matches the lookup string at the beginning of any string that does not match pattern. This is a non-acquisition match, that is, the match does not need to be acquired for later use. For example, " Windows(?!95|98|NT|2000)" can match " Windows3.1" in " Windows", but not " Windows2000" in " Windows". Lookahead consumes no characters, that is, after a match occurs, the search for the next match begins immediately after the last match, not after the character containing the lookahead |
| (?<=pattern) | Reverse positive pre-check is similar to positive positive pre-check, but in the opposite direction. For example, " (?<=95|98|NT|2000)Windows" can match " 2000Windows" in " Windows", but not " 3.1Windows" in " Windows". |
| (?<!pattern) | The reverse negative pre-check is similar to the forward negative pre-check, but in the opposite direction. For example, " (?<!95|98|NT|2000)Windows" can match " 3.1Windows" in " Windows", but not " 2000Windows" in " Windows". |
| x|y | matches x or y. For example, " z|food" can match " z" or " food". " (z|f)ood" matches " zood" or " food". |
| [xyz] | character collection. Matches any one of the included characters. For example, " [abc]" can match " plain" in " a". |
| [^xyz] | A collection of negative characters. Matches 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 any lowercase alphabetic character in the range " a" to " ".z |
| [^a-z] | Negative character range. Matches any arbitrary character not in the specified range. For example, " [^a-z]" can match any character that is not in the range " a" to " z". |
| \b | Matches a word boundary, that is, the position between a word and a space. For example, " er\b" can match " never" in " er", but not " verb" in " er". |
| \B | 匹配非单词边界。“er\B”能匹配“verb”中的“er”，但不能匹配“never”中的“er”。 |
| \cx | 匹配由x指明的控制字符。例如，\cM匹配一个Control-M或回车符。x的值必须为A-Z或a-z之一。否则，将c视为一个原义的“c”字符。 |
| \d | 匹配一个数字字符。等价于[0-9]。 |
| \D | 匹配一个非数字字符。等价于[^0-9]。 |
| \f | 匹配一个换页符。等价于\x0c和\cL。 |
| \n | 匹配一个换行符。等价于\x0a和\cJ。 |
| \r | 匹配一个回车符。等价于\x0d和\cM。 |
| \s | 匹配任何空白字符，包括空格、制表符、换页符等等。等价于[ \f\n\r\t\v]。 |
| \S | 匹配任何非空白字符。等价于[^ \f\n\r\t\v]。 |
| \t | 匹配一个制表符。等价于\x09和\cI。 |
| \v | 匹配一个垂直制表符。等价于\x0b和\cK。 |
| \w | 匹配包括下划线的任何单词字符。等价于“[A-Za-z0-9_]”。 |
| \W | 匹配任何非单词字符。等价于“[^A-Za-z0-9_]”。 |
| \xn | 匹配n，其中n为十六进制转义值。十六进制转义值必须为确定的两个数字长。例如，“\x41”匹配“A”。“\x041”则等价于“\x04&1”。正则表达式中可以使用ASCII编码。. |
| \num | 匹配num，其中num是一个正整数。对所获取的匹配的引用。例如，“(.)\1”匹配两个连续的相同字符。 |
| \n | 标识一个八进制转义值或一个向后引用。如果\n之前至少n个获取的子表达式，则n为向后引用。否则，如果n为八进制数字（0-7），则n为一个八进制转义值。 |
| \nm | 标识一个八进制转义值或一个向后引用。如果\nm之前至少有nm个获得子表达式，则nm为向后引用。如果\nm之前至少有n个获取，则n为一个后跟文字m的向后引用。如果前面的条件都不满足，若n和m均为八进制数字（0-7），则\nm将匹配八进制转义值nm。 |
| \nml | 如果n为八进制数字（0-3），且m和l均为八进制数字（0-7），则匹配八进制转义值nml。 |
| \un | 匹配n，其中n是一个用四个十六进制数字表示的Unicode字符。例如，\u00A9匹配版权符号（©）。 |
常用正则表达式
| 用户名 | /^[a-z0-9_-]{3,16}$/ | |
|---|---|---|
| 密码 | /^[a-z0-9_-]{6,18}$/ | |
| 十六进制值 | /^#?([a-f0-9]{6}|[a-f0-9]{3})$/ | |
| 电子邮箱 | /^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/ /^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/ |
|
| URL | /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/ | |
| IP 地址 | /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\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]?)$/ |
|
| HTML 标签 | /^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/ | |
| 删除代码\\注释 | (?<!http:|\S)//.*$ | |
| 匹配所有的小写字母 | [a-z] | |
| 匹配所有的大写字母 | [A-Z]td> | |
| 匹配所有的字母 | [a-zA-Z]td> | |
| 匹配所有的数字 | [0-9]td> | |
| 匹配所有的数字，句号和减号 | [0-9\.\-] | |
| 匹配所有的白字符 | [ \f\r\t\n] | |
| Unicode编码中的汉字范围 | /^[\u2E80-\u9FFF]+$/ |