---
title: "localizedDoublePercentage(locale:)"
framework: swift
role: symbol
role_heading: Type Method
path: "swift/regexcomponent/localizeddoublepercentage(locale:)"
---

# localizedDoublePercentage(locale:)

Creates a regex component that matches a localized percentage string, capturing it as a double-precision floating-point value.

## Declaration

```swift
static func localizedDoublePercentage(locale: Locale) -> Self
```

## Parameters

- `locale`: The locale that specifies formatting conventions to use when matching percentage strings.

## Return Value

Return Value A RegexComponent that matches localized percentage substrings as Double instances.

## Discussion

Discussion This method matches percentage substrings in accordance with the provided locale. For example, in the en_US locale, 0.75 formats as 75%, and 12345.67 formats as 1,234,567%. Other locales use different separators, or omit them entirely. Because of this, the regex needs to know what locale convention to match against. The following example creates a Regex that matches a date and time followed by whitespace and a percentage string formatted in the en_US locale. It then matches this regex against a source string containing a date with this format, some whitespace, and a percentage string. let enUSLocale = Locale(languageCode: .english, languageRegion: .unitedStates) let source = "7/31/2022, 5:15:12 AM  75.3%" let matcher = Regex {     One(.dateTime(date: .numeric,                   time: .standard,                   locale: enUSLocale,                   timeZone: TimeZone(identifier: "PST")!))     OneOrMore(.horizontalWhitespace)     Capture {         One(.localizedDoublePercentage(locale: enUSLocale))     } } guard let match = source.firstMatch(of: matcher) else { return } let percentage = match.1 // percentage == 0.753

## See Also

### Matching numeric formats

- [localizedInteger(locale:)](swift/regexcomponent/localizedinteger(locale:).md)
- [localizedDouble(locale:)](swift/regexcomponent/localizeddouble(locale:).md)
- [localizedDecimal(locale:)](swift/regexcomponent/localizeddecimal(locale:).md)
- [localizedCurrency(code:locale:)](swift/regexcomponent/localizedcurrency(code:locale:).md)
- [localizedIntegerCurrency(code:locale:)](swift/regexcomponent/localizedintegercurrency(code:locale:).md)
- [localizedIntegerPercentage(locale:)](swift/regexcomponent/localizedintegerpercentage(locale:).md)