Use libphonenumber instead of regex for international phone validation

Short summary

Regex-based phone validation is fragile because international numbering plans change over time and vary by country. The fix is Google's libphonenumber (or its JS port libphonenumber-js), which provides country-aware validity checks, number type detection, and canonical normalization. The article includes code examples and a gotcha about ambiguous local-format numbers needing a country hint.

• •Regex phone validation silently breaks as numbering plans change
• •libphonenumber-js provides country-aware validation and normalization
• •Pass a default country for local-format numbers to avoid ambiguity

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