我有一个必须采用以下格式的字符串：
XXXX-XX-XXX-XXXX-XXXXXXXXXX-X
其中 X 是一个整数。整数的数量无关紧要。我只需要确保字符串：
- 以整数开头和结尾
- 仅包含用破折号分隔的整数
验证这一点的最简单方法是什么？
问问题
22209 次
4 回答
14
这个正则表达式应该可以解决问题。它使用否定的lookbehind来避免连续匹配多个破折号。
^\d(\d|(?<!-)-)*\d$|^\d$
^ ^ ^ ^
| | | -- is a single digit, or
| | ------- ends with a digit
| ----------------consists on digits or dashes not preceded by dashes
---------------------starts with a digit
这是一个说明其用法的 C# 代码（也在ideone上）：
var r = new Regex("^\\d(\\d|(?<!-)-)*\\d$|^\\d$");
Console.WriteLine(r.IsMatch("1-2-3"));
Console.WriteLine(r.IsMatch("1-222-3333"));
Console.WriteLine(r.IsMatch("123"));
Console.WriteLine(r.IsMatch("1-2-3-"));
Console.WriteLine(r.IsMatch("1"));
Console.WriteLine(r.IsMatch("-11-2-3-"));
于 2012-05-17T13:08:54.500 回答
8
使用正则表达式。
^\d[-0-9]+\d$
这假定字符串至少有三个字符长。
分解：
^ - match start of string
\d - match a digit
[ - start of character class containing:
- - a dash
0-9 - 0 to 9
] - end of character class
+ - match one or more of the previous
\d - match a digit
$ - match end of string
您可以将 更改+为*使 2 位字符串有效，并添加一个替代项以使 1 位字符串也有效：
^(\d|\d[-0-9]*\d)$
注意：在 .NET 中，\d将匹配任何Unicode 数字（例如，阿拉伯数字将匹配） - 如果您不希望这样，请在每个地方替换\d为。[0-9]
于 2012-05-17T13:09:25.840 回答
5
您可以编写一个正则表达式来解决问题。
比您可以使用该正则表达式来验证您的字符串
^ ---->Start of a string.
$ ---->End of a string.
. ----> Any character (except \n newline)
{...}----> Explicit quantifier notation.
[...] ---->Explicit set of characters to match.
(...) ---->Logical grouping of part of an expression.
* ---->0 or more of previous expression.
+ ---->1 or more of previous expression.
? ---->0 or 1 of previous expression; also forces minimal matching when an expression might match several strings within a search string.
\ ---->Preceding one of the above, it makes it a literal instead of a special character. Preceding a special matching character, see below.
\w ----> matches any word character, equivalent to [a-zA-Z0-9]
\W ----> matches any non word character, equivalent to [^a-zA-Z0-9].
\s ----> matches any white space character, equivalent to [\f\n\r\v]
\S----> matches any non-white space characters, equivalent to [^\f\n\r\v]
\d ----> matches any decimal digits, equivalent to [0-9]
\D----> matches any non-digit characters, equivalent to [^0-9]
\a ----> Matches a bell (alarm) \u0007.
\b ----> Matches a backspace \u0008 if in a [] character class; otherwise, see the note following this table.
\t ---->Matches a tab \u0009.
\r ---->Matches a carriage return \u000D.
\v ---->Matches a vertical tab \u000B.
\f ---->Matches a form feed \u000C.
\n ---->Matches a new line \u000A.
\e ---->Matches an escape \u001B
$number ----> Substitutes the last substring matched by group number number (decimal).
${name} ----> Substitutes the last substring matched by a (? ) group.
$$ ----> Substitutes a single "$" literal.
$& ----> Substitutes a copy of the entire match itself.
$` ----> Substitutes all the text of the input string before the match.
$' ----> Substitutes all the text of the input string after the match.
$+ ----> Substitutes the last group captured.
$_ ----> Substitutes the entire input string.
(?(expression)yes|no) ----> Matches yes part if expression matches and no part will be ommited.
更多信息在
http://geekswithblogs.net/brcraju/archive/2003/10/23/235.aspx
于 2012-05-17T13:07:51.363 回答
1
正则表达式可能是可行的方法，这可能会有所帮助：
于 2012-05-17T13:08:52.783 回答