| 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 in JScript
0…
9 properties. 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) |
正向否定预查，在任何不匹配pattern的字符串开始处匹配查找字符串。这是一个非获取匹配，也就是说，该匹配不需要获取供以后使用。例如“Windows(?!95|98|NT|2000)”能匹配“Windows3.1”中的“Windows”，但不能匹配“Windows2000”中的“Windows”。预查不消耗字符，也就是说，在一个匹配发生后，在最后一次匹配之后立即开始下一次匹配的搜索，而不是从包含预查的字符之后开始 |
| (?<=pattern) |
反向肯定预查，与正向肯定预查类拟，只是方向相反。例如，“(?<=95|98|NT|2000)Windows”能匹配“2000Windows”中的“Windows”，但不能匹配“3.1Windows”中的“Windows”。 |
| (?<!pattern) |
反向否定预查，与正向否定预查类拟，只是方向相反。例如“(?<!95|98|NT|2000)Windows”能匹配“3.1Windows”中的“Windows”，但不能匹配“2000Windows”中的“Windows”。 |
| x|y |
匹配x或y。例如，“z|food”能匹配“z”或“food”。“(z|f)ood”则匹配“zood”或“food”。 |
| [xyz] |
字符集合。匹配所包含的任意一个字符。例如，“[abc]”可以匹配“plain”中的“a”。 |
| [^xyz] |
负值字符集合。匹配未包含的任意字符。例如，“[^abc]”可以匹配“plain”中的“p”。 |
| [a-z] |
字符范围。匹配指定范围内的任意字符。例如，“[a-z]”可以匹配“a”到“z”范围内的任意小写字母字符。 |
| [^a-z] |
负值字符范围。匹配任何不在指定范围内的任意字符。例如，“[^a-z]”可以匹配任何不在“a”到“z”范围内的任意字符。 |
| \b |
匹配一个单词边界，也就是指单词和空格间的位置。例如，“er\b”可以匹配“never”中的“er”，但不能匹配“verb”中的“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（©）。 |