Java: Find the number of times a word is present in a String (is there something similar to expression of C#)?

问题

I am interesting in finding the number of times a word appears in a String.
I have seen the example of SUN Matcher Demo using the matcher (constructs a regex and counts the groups).

I was interested if this is the only way or there is something else like e.g.

Regex.Matches( input, "true" ).Count in C# (from SO question).

Or in my context:

If I am in a loop using contains to check if certain words in the List appear in the String is there a simple/elegant way to get (on the spot??) the number of times the word occurs (that I already know it exists)?

回答1:

You can do something like

Pattern p = Pattern.compile(toFind, Pattern.LITERAL | Pattern.CASE_INSENSITIVE);
int occurances = p.split(text, -1).length -1;

来源：https://stackoverflow.com/questions/8975019/java-find-the-number-of-times-a-word-is-present-in-a-string-is-there-something