如何在一个字符串计数特殊字符

问题描述

解决方案

Using replaceAll:

    String str = "one$two$three$four!five@six$";

    int count = str.length() - str.replaceAll("\\$","").length();

    System.out.println("Done:"+ count);

Prints:

Done:4

Using replace instead of replaceAll would be less resource intensive. I just showed it to you with replaceAll because it can search for regex patterns, and that's what I use it for the most.

Note: using replaceAll I need to escape $, but with replace there is no such need:

str.replace("$");
str.replaceAll("\\$");

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