public static Integer indexOfStr(String str,String findStr, int index){
Pattern pattern = Pattern.compile(findStr);
Matcher findMatcher = pattern.matcher(str);
int number = 0;
while(findMatcher.find()) {
number++;
if(number == index){
break;
}
}
try {
return findMatcher.start();
} catch (Exception e) {
return null;
}
}
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