regex to check the log prefix

Asked Jul 31 '17 at 09:32

Active Jul 31 '17 at 09:33

Viewed 15 times

I'm trying to check if a log record starts with a log level and log date prefix. Here is an example of log record:

[7][20170731 10:36:39:754][18] [just a text] another test

Here is what I've tried:

//string text = "[7][20170731 10:36:39:754][18] [just a text] another test";
string text = "[7][20170731]";
var pattern = "[\\d{1}][\\d{8}\\s\\d{2}:\\d{2}:\\d{2}:\\d{3}].*";

if (Regex.IsMatch(text, pattern))
{
    Console.WriteLine("match");
}
else
{
    Console.WriteLine("not match");
}

But my problem is that with the second version of the text variable Regex.IsMatch returns true even if it's obvious that it's not a match.

So is my pattern wrong?

edited Jul 31 '17 at 09:33

Mighty Badaboom

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asked Jul 31 '17 at 09:32

Buda Gavril

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A `[` should be escaped when outside of a character class to match a literal `[`. Otherwise, you created a character class with `[...]`. – Wiktor Stribiżew Jul 31 '17 at 09:34
You need to escape `[` and `]` if you want this regex to work – Viktor Jacynycz Jul 31 '17 at 09:36
Indeed, this was the problem. Thanks – Buda Gavril Jul 31 '17 at 09:39

regex to check the log prefix

0 Answers0