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Using Regex
To return only documents that match regular expression,
use the Regex method which enables RavenDB to perform server-side pattern matching queries.
The supplied regular expression must be .NET compatible.
Example
// loads all products, which name
// starts with 'N' or 'A'
List<Product> products = session
.Query<Product>()
.Where(x => Regex.IsMatch(x.Name, "^[NA]"))
.ToList();// loads all products, which name
// starts with 'N' or 'A'
List<Product> products = await asyncSession
.Query<Product>()
.Where(x => Regex.IsMatch(x.Name, "^[NA]"))
.ToListAsync();from Products
where regex(Name, '^[NA]')
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