Dart - not a fan of being creative.
String encryptNum(String phoneNum) { var regexp = RegExp(r"([0-9- .]+)"); var result = regexp?.firstMatch(phoneNum)?.group(0); result = result?.replaceAll(new RegExp(r"(\.|-|\s)"), ""); if(result.length == 10) { var val = StringBuffer(); for(var idx = 0; idx < result.length; idx++) { if(idx < 4) { val.write(result[idx]); } else { val.write("X"); } switch(idx) { case 2: case 5: val.write("-"); break; } } return val.toString(); } return null; }
print(encryptNum("142 424 2142")); print(encryptNum("142 424-2142")); print(encryptNum("142 424.2142")); print(encryptNum("142 4242142")); print(encryptNum("142-424-2142")); print(encryptNum("142-424 2142")); print(encryptNum("142-424.2142")); print(encryptNum("142-4242142")); print(encryptNum("142.424 2142")); print(encryptNum("142.424-2142")); print(encryptNum("142.424.2142")); print(encryptNum("142.4242142")); print(encryptNum("142424-2142")); print(encryptNum("142424.2142")); print(encryptNum("142424 2142")); print(encryptNum("1424242142"));
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Dart - not a fan of being creative.