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Given a String, return the number of digits that it contains. Digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.


string_numDigits("Room 1525") → 4
string_numDigits("Java 8") → 1
string_numDigits("L33T") → 2

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public int string_numDigits(String text) { }

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