# localizedDecimal(locale:) Creates a regex component that matches a localized decimal string, capturing it as a Foundation decimal. ``` static func localizedDecimal(locale: Locale) -> Self ``` ## Parameters `locale` The locale that specifies formatting conventions to use when matching decimal strings. ## Return Value A `RegexComponent` that matches localized decimal substrings as Foundation instances. ## Discussion This method matches decimal substrings in accordance with the provided locale. For example, the value `1234567890.1234` formats as `1,234,567,890.1234` in the `en_US` locale, as `1 234 567 890,1234` in the `FR` locale, and as `1234567890.1234` in the `JP` locale. Because of this, the regex needs to know what locale convention to match against. The following example creates a [`Regex`](/documentation/Swift/Regex) that matches a date and time followed by whitespace and a decimal 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 decimal value. ``` let enUSLocale = Locale(languageCode: .english, languageRegion: .unitedStates) let source = "7/31/2022, 5:15:12 AM 1,234,567,890.1234" let matcher = Regex { One(.dateTime(date: .numeric, time: .standard, locale: enUSLocale, timeZone: TimeZone(identifier: "PST")!)) OneOrMore(.horizontalWhitespace) Capture { One(.localizedDecimal(locale: enUSLocale)) } } guard let match = source.firstMatch(of: matcher) else { return } let decimal = match.1 // decimal == 1234567890.1234 ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)