DKNet

Extract and inspect numeric-looking text

Part of DKNet.Fw.Extensions. Use StringExtensions for permissive character filtering and numeric-looking text checks.

using System;
using DKNet.Fw.Extensions.Primitives;

Console.WriteLine("Price: $123.45".ExtractDigits()); // 123.45
Console.WriteLine("12 and 34".ExtractDigits()); // 1234
Console.WriteLine("1.234,56".IsNumber()); // True
Console.WriteLine(".".IsNumber()); // True

ExtractDigits rents a buffer from ArrayPool<char>.Shared and returns it in finally. It retains every character accepted by char.IsDigit, plus ., , and -, across the whole input.

IsNumber returns false for null or whitespace, non-digit characters outside those separators, adjacent commas, more than one dot, or a minus sign after the first position. It does not parse a numeric value.

⚠️ Gotchas & limits

• ExtractDigits throws ArgumentNullException for null and joins separated digit groups together.
• IsNumber accepts ".", "," and "-"; it does not require a digit. Use a numeric parser when conversion or validation is required.
• There is no culture option or separator normalization; extraction preserves the original separators.

This site is open source. Improve this page.