In C# I need to split a string (a log4j log file) into array elements based on a particular sequence of characters, namely "nnnn-nn-nn nn:nn:nn INFO". I'm currently splitting this log file up by newlines, which is fine except when the log statements themselves contain newlines.
I don't control the input (the log file) so escaping them somehow is not an option.
It seems like I should be able to use a comparator or a regex to identify the strings, but String.Split does not have an option like that.
Am I stuck rolling my own, or is there a pattern开发者_StackOverflow or framework component that can be of help here?
Use Regex.Split() for this.
This regex should work but you might find a better one:
@"\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d INFO"
I ended up having to roll my own to some extent on this one, because I need the delimiter, which Regex.Split eats.
private List<string> splitOnLogDelimiter(string bigString)
{
Regex r = new Regex("[0-9]{4,4}-[0-9]{2,2}-[0-9]{2,2} [0-9]{2,2}:[0-9]{2,2}:[0-9]{2,2} INFO");
List<string> result = new List<string>();
//2010-03-26 16:06:38 INFO
int oldIndex = 0;
int newIndex = 0;
foreach (Match m in r.Matches(bigString))
{
newIndex = m.NextMatch().Index-1;
if (newIndex <= 0) break;
result.Add(bigString.Substring(oldIndex, newIndex - oldIndex));
oldIndex = newIndex+1;
}
return result;
}
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