问题
I knew that we have something like this in the regular expression syntax world.
*The syntax is {min,max}, where min is a positive integer number indicating the minimum number of matches, and max is an integer equal to or greater than min indicating the maximum number of matches.
So {0,} is the same as *, and {1,} is the same as +*.
http://www.regular-expressions.info/repeat.html
But how can I use it in SQL Server Management Studio or Visual Studio's "Find and Replace" window. I only find related Microsoft syntax in MSDN. Like:
[0-9]^4 matches any 4-digit sequence.
回答1:
The Visual Studio regex implementation (in versions up until Visual Studio 2010) is a fairly nonstandard one to say the least, and it doesn't have this feature. You can only spell it out:
* or @: Match zero or more of the preceding expression
+ or #: Match one or more of the preceding expression
^n: Match exactly n repetitions of the preceding expression
So for A{2,4} you'd have to use A^4|A^3|A^2 (see polygenelubricant's comment for an explanation why you need to do it in descending order).
More recent versions of Visual Studio support the entire set of .NET regexes.
来源：https://stackoverflow.com/questions/3350828/how-do-i-find-min-max-repeats-with-regular-expression-patterns-in-visual-studi