using System;
public class Test
{
public static void Main()
{
var s = "PH/2400310945 01.09.21 WARRANTY2021091D 19307.92- 0 -19,307.92";
var result = System.Text.RegularExpressions.Regex.Match(s, @" -?\d+(?:,\d{3})*(?:\.\d{2})?$").Value;
Console.WriteLine(result);
}
}
dXNpbmcgU3lzdGVtOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoJCXZhciBzID0gIlBILzI0MDAzMTA5NDUgMDEuMDkuMjEgV0FSUkFOVFkyMDIxMDkxRCAxOTMwNy45Mi0gMCAtMTksMzA3LjkyIjsKICAgICAgICB2YXIgcmVzdWx0ID0gU3lzdGVtLlRleHQuUmVndWxhckV4cHJlc3Npb25zLlJlZ2V4Lk1hdGNoKHMsIEAiIC0/XGQrKD86LFxkezN9KSooPzpcLlxkezJ9KT8kIikuVmFsdWU7CiAgICAgICAgQ29uc29sZS5Xcml0ZUxpbmUocmVzdWx0KTsKCX0KfQ==