using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var strs = new List<string> { "[45645]","[5456]","[PB15] [DEC]","[PB16] []"};
foreach (var str in strs) {
var result = Regex.Matches(str, @"\[[^][0-9]*[0-9][^][]*]")
.Cast<Match>()
.Select(x => x.Value)
.ToList();
foreach (var s in result)
Console.WriteLine(s);
}
}
}
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