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Strip phone number formatting
* removes any non-digit character from the phone number
* @param phoneNumber number to be de-formatted
* @return phone number digits
protected String clearFormatting(String phoneNumber)
StringBuilder out = new StringBuilder(phoneNumber.length());
int lower = ((int)'0'-1);
int upper = ((int)'9'+1);
for (char c : phoneNumber.toCharArray() )
{ //only collect the digits
if ( lower < c && upper > c ) { out.append(c); }
return out.toString();
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