C＃正则表达式模式这与之匹配

Question

能有人解释这个正则表达式将检查什么

Regex x = new Regex("{([^}]+)}");

Answer 1

It looks for a {...} with some (1 or more) non-} inside. If successful it puts the content of the {...} in capture group 1.

Regex x = new Regex("{([^}]+)}");
var m = x.Match("{Hello}");

string str0 = m.Groups[0].ToString(); // {Hello}
string str1 = m.Groups[1].ToString(); // Hello

Group 0 is always the whole match.

var m2 = x.Match("{}");
var success = m2.Success; // false

It isn't anchored, so it could have more than one match for each string...

var m2 = x.Matches("{Hello}{}{World}");
int c = m2.Count; // 2 matches. The {} wasn't a match, {Hello} and {World} were

As a sidenote, if you think this is the beginning for a good C# parser, you are on the wrong road :-) Expressions like { { string str = "Hello"; } str += "x"; } { { string str = "Hello"; } str += "x"; } { { string str = "Hello"; } str += "x"; } will confuse this regex, so expressions like { string str = "}" } . This is a stackless regex. No fancy tricks.

Answer 2

It matches anything between curly braces, if there at least one character.

There is group () inside braces {} . This group should have at least one []+ symbol which is not closing brace ^} .

Answer 3

它匹配花括号之间的任何内容，例如{ddhhh13233dddd} {ddd}

Answer 4

This will catch everything within the curly brackets.

This MSDN article can explain it in more detail.

Answer 5

This will catch everything within the curly brackets.

I find this tool is the best for explaining Regex's

http://tinyurl.com/lz3d458