如何在一个字符串计数特殊字符 [英] how to count special character in a string
问题描述
可能重复:结果
<一href=\"http://stackoverflow.com/questions/11238184/string-functions-how-to-count-delimiter-in-string-line\">String功能如何计算的串线定界符
块引用>
我有一个字符串作为海峡=一$ $的两个三个$四!5 @ 6 $现在怎么样用java code算在该字符串$的总数。
块引用>解决方案使用的replaceAll:
字符串str =一$ $的两个三个$四五@ 6 $!; 诠释计数= str.length() - str.replaceAll(\\\\ $,)的长度(); 的System.out.println(完成:+计数);
打印:
完成:4
使用的替换而不是的replaceAll 资源密集型会少些。我只是把它展示给你的的replaceAll ,因为它可以搜索正则表达式的模式,这就是我用它为最。
请注意:使用的replaceAll 我要逃跑的 $ ,但是替换有没有这样的需要:
str.replace($);
str.replaceAll(\\\\ $);Possible Duplicate:
String Functions how to count delimiter in string line
I have a string as str = "one$two$three$four!five@six$" now how to count Total number of "$" in that string using java code.
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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