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public String get() {
String str = "speed=2000MHz";
return "2000";
}
String s = "speed=2000MHz1024";
String num = s.replaceAll("speed\\s*=\\s*(\\d+).*", "$1");
System.out.println(num);
String str = "speEd=2000MHz";
Pattern p = Pattern.compile("(?i).*?=(\\d*)");
Matcher m = p.matcher(str);
m.find();
System.out.println(m.group(1));