I have an array which contains an elements as below
dec.02
Novemeber-2
Oct-6
.
.
.
Now suppose I want to find the index of dec.02 Suppose if an array in place of dec.02 there can be december-02. So I want to use linq with regex which finds the index. Date can be in any format
Regex will be (dec|december)\W*02
Can any one tell how to use regex with linq to find index from an array
Are you looking for something like that?
String[] data = new String[] {
"dec.02",
"Novemeber-2",
"Oct-6",
...
};
// All the indexes
int[] indice = data
.Select((line, index) => new {
line = line,
index = index})
.Where(item => Regex.IsMatch(item.line, "Your regular expression"))
.Select(item => item.index)
.ToArray();
In case you want 1st such index only (-1 if no index found):
// First index (or -1 if there's no such index)
int result = data
.Select((line, index) => new {
line = line,
index = index})
.Where(item => Regex.IsMatch(item.line, "Your regular expression"))
.Select(item => item.index + 1)
.FirstOrDefault() - 1;
FirstOrDefault() instead of ToArray(), see my edit.If I understand your question correctly, this can be a solution:
Regex regex = new Regex(@"(dec|december)\W*02");
string[] dates = { "dec.02", "Novemeber-2", "Oct-6" };
int i = dates.Length - dates.SkipWhile(s => !regex.IsMatch(s)).Count(); // based-0 index
