RegEx - verify content and size

[New ID]

Hello,
I need to check a string, it must contain an email whose maximum length is limited, the basic RegExp is

^ [a-zA-Z0-9 \ -] (1). [a-zA-Z0-9 \ -] (1) @ [a-zA-Z0-9 \. \ -] (1) . [az] (2,5) $

The problem is that I do not know how to control in the same regular expression as the total size does not exceed 100 characters included. In fact what I need is a form of "AND" logic. I need it because i want to verify the content and size. If you know one then please do post back. Thanks in advance.

[GlassFish]

Hello,
You can go out with the following regular expression.

^(?=.{ 1.100) $) [a-zA-Z0-9 \ -] (1). [A-zA-Z0-9 \ -] (1) @ [a-zA-Z0-9 \. \ -] (1). [az] (2,5) $

However, as stated in verbose it is best if possible to make a simple chain.length () and check the size. That would avoid adding to the regex and should be faster. First I will recommend you to test this in your code and if it is successful then it will be good for your code.

[New ID]

Hi
Thank you for your response. I can not verify the size directly because I'm working on a function that checks each line of a file from a dozen online. This function takes the input file and a table containing a RegExp line of the file. The funny thing is that each line contains several fields. The line by line audit file with the RegExp works perfectly and is very powerful, my only problem is managing the email field.

[SoftWore]

Hello,
This expression should be valid with the RE engine standard Java API. I suppose the engine jakarta does not bear the Lookaround. Which is the standard java RE engine are you using? If you know that then please post back. Because I do not think what you are doing will succeed. Currently I do not have a way round, but if I come to know one then i will post.

[Windowed]

Hello,
Lookaround No, I do not think you can get away with a single regexp. Maybe you should look for another engine. On the site of the regex lib Jakarta there is a link to the Project ORO which is compatible with Perl 5 (it seems to me that Lookaround appeared in perl 5), but I do not know what it's worth really. Edition after verification, I confirmed with OROIt should work. If you need you can try this and test.

[New ID]

Hey,
Here is my code, please check it and if I am wrong somewhere, then please guide me.

Public class TestRegExp {
 
	Public static void hand(String[] args) {
		
		
		String str = "(?=[^;]{ 7.100);) [a-zA-Z0-9\\-_]{1,}\\. [a-zA-Z0-9\\-_] (1) @ [a-zA-Z0-9\\-_\\.]{1,}\\. [a-zA-Z] (2) ";;

String strTest = "31122001";

Perl5Compiler com = new Perl5Compiler();
Perl5Matcher mat = new Perl5Matcher();
Perl5Pattern p;
		try {
			p = (Perl5Pattern) com.compiles(str);
			if(mat.games(strTest, p)) {
				System.out.System.out.println("OK");
			} else {
				System.out.System.out.println("not OK");
			}
		} catch (MalformedPatternException e) {
			/ / TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}