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Currency validation support #4430

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Currency validation support #4430

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fa1878b
currency validation support
olegL1337 Dec 16, 2021
392b783
regex fix :)
olegL1337 Dec 16, 2021
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5 changes: 5 additions & 0 deletions Microsoft.Toolkit.Uwp.UI/Extensions/TextBox/TextBoxExtensions.Regex.Data.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,11 @@ public enum ValidationType
/// </summary>
Decimal,

/// <summary>
/// Currency validation
/// </summary>
Currency,

Comment on lines +56 to +60
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@michael-hawker michael-hawker Dec 16, 2021

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Should be added at the end so not a breaking change.

/// <summary>
/// Text only validation
/// </summary>
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6 changes: 6 additions & 0 deletions Microsoft.Toolkit.Uwp.UI/Extensions/TextBox/TextBoxExtensions.Regex.Internals.cs
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Expand Up @@ -70,6 +70,12 @@ private static void ValidateTextBox(TextBox textBox, bool force = true)
case ValidationType.Decimal:
regexMatch = textBox.Text.IsDecimal();
break;
case ValidationType.Currency:
// @"(^\d*\.\d{2}$)" regex pattern to detect currency sign with currency value
// Mathes: $100.00, $100, $10.25
// Non-Matches: 100., $10.233, $10.
regexMatch = Regex.IsMatch(textBox.Text, @"(^\d*\.\d{2}$)");
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@Arlodotexe Arlodotexe Dec 16, 2021 •
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We should handle currency symbols and decimal separators other than USD. Luckily, dotnet has this functionality built in and we don't need to fiddle with Regex.

System.Globalization.NumberFormatInfo should have everything we need for this.

Firing up an empty console app, here's what we have to work with.

string FormatCurrency(string value)
{
    // Parse the entered data into a decimal, allowing existing currency symbols.
    decimal.TryParse(value, NumberStyles.Currency, out var amount);

    // Format the decimal into a human readable string for the current culture.
    return amount.ToString("C2", CultureInfo.CurrentCulture);
}

// Stress testing USD
FormatCurrency("500"); // $500.00
FormatCurrency("5"); // $5.00
FormatCurrency("5.00"); // $5.00
FormatCurrency(".05"); // $0.05
FormatCurrency(".5"); // $0.50
FormatCurrency("$.5"); // $0.50

// With other cultures
FormatCurrency("5"); // nl-NL, € 5,00
FormatCurrency("5"); // fr-FR, 5,00 €
FormatCurrency("5"); // ja-JP, ¥5.00
FormatCurrency("5"); // en-GB, £5.00

break;
case ValidationType.Email:
regexMatch = textBox.Text.IsEmail();
break;
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