Sha256: 0e819bfd599b573cb833cee1fa3b32abd50f0f119164a020a4a9c2332aae5c06
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Size: 1.58 KB
Versions: 37
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Stored size: 1.58 KB
Contents
class PhoneNumber {
/// Returns `String` for a valid number, `null` for invalid.
String clean(String phoneNumber) {
/// initialize an empty string.
String onlyDigits = "";
/// find all digits.
Iterable<Match> findDigits = new RegExp(r'\d+').allMatches(phoneNumber);
findDigits.forEach((match) {
onlyDigits += match.group(0);
/// remove all digits **for an edge case**.
phoneNumber = phoneNumber.replaceAll(match.group(0), "");
});
/// Only these special characters are allowed.
/// **"." "(" ")" "-" "+" ** and space,
/// remove these characters.
phoneNumber = phoneNumber.replaceAll(new RegExp(r"^[-.()+\s]*$"), "");
/// "123-@:!-7890" is invalid, however **"123-@:!-789012"** is valid
/// by the current logic since the regex grabs all the digits
/// but "123-@:!-78901256" should be considered as invalid.
/// hence if anything else still exists its an invalid number.
if (phoneNumber.length > 0) return null;
/// remove leading country code **1** to make it easy to process.
if (onlyDigits.startsWith("1")) {
onlyDigits = onlyDigits.substring(1);
}
if (onlyDigits.length < 10 || onlyDigits.length > 10) return null;
/// after removing the country code if it exists,
/// first and fourth digits can only range from **2-9**
/// i.e. Area code and Exchange code.
RegExp codeRange = new RegExp(r'^[2-9]$');
if (codeRange.hasMatch(onlyDigits[0]) && codeRange.hasMatch(onlyDigits[3])) {
return onlyDigits;
}
/// if a condition isn't accounted for.
return null;
}
}
Version data entries
37 entries across 37 versions & 1 rubygems