[Java] Mask some part of String

return String.replaceAll("\\b(\\d{3})\\d+(\\d{3})", "$1****$2");  
# 1234567890 =&gt; 123****890

return String.replaceAll("\\b(\\d{3})\\d+(\\d{3})", "$1****$2");

# 1234567890 => 123****890

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