forked from core/mobile_nebula
35 lines
790 B
Dart
35 lines
790 B
Dart
// Inspired by https://github.com/suragch/string_validator/blob/master/lib/src/validator.dart
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bool dnsValidator(str, {requireTld = true, allowUnderscore = false}) {
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if (str == null) {
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return false;
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}
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List parts = str.split('.');
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if (requireTld) {
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var tld = parts.removeLast();
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if (parts.isEmpty || !RegExp(r'^[a-z]{2,}$').hasMatch(tld)) {
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return false;
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}
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}
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for (var part, i = 0; i < parts.length; i++) {
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part = parts[i];
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if (allowUnderscore) {
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if (part.indexOf('__') >= 0) {
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return false;
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}
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}
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if (!RegExp(r'^[a-z\\u00a1-\\uffff0-9-]+$').hasMatch(part)) {
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return false;
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}
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if (part[0] == '-' || part[part.length - 1] == '-' || part.indexOf('---') >= 0) {
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return false;
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}
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}
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return true;
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}
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