backend v4 half

SerpentRace_Backend/node_modules/libphonenumber-js/source/helpers/extension/extractExtension.js

@@ -0,0 +1,29 @@
+import createExtensionPattern from './createExtensionPattern.js'
+
+// Regexp of all known extension prefixes used by different regions followed by
+// 1 or more valid digits, for use when parsing.
+const EXTN_PATTERN = new RegExp('(?:' + createExtensionPattern() + ')$', 'i')
+
+// Strips any extension (as in, the part of the number dialled after the call is
+// connected, usually indicated with extn, ext, x or similar) from the end of
+// the number, and returns it.
+export default function extractExtension(number) {
+	const start = number.search(EXTN_PATTERN)
+	if (start < 0) {
+		return {}
+	}
+	// If we find a potential extension, and the number preceding this is a viable
+	// number, we assume it is an extension.
+	const numberWithoutExtension = number.slice(0, start)
+	const matches = number.match(EXTN_PATTERN)
+	let i = 1
+	while (i < matches.length) {
+		if (matches[i]) {
+			return {
+				number: numberWithoutExtension,
+				ext: matches[i]
+			}
+		}
+		i++
+	}
+}