如何识别一个字符串是否包含一个以上特定字符的实例? [英] How to identify if a string contains more than one instance of a specific character?

问题描述

我想检查一个字符串中是否包含多个字符?如果我有一个字符串12121.23.2，那么我想检查它是否包含多个字符串.在字符串中.

I want to check if a string contains more than one character in the string? If i have a string 12121.23.2 so i want to check if it contains more than one . in the string.

推荐答案

您可以将 IndexOf 与 LastIndexOf 进行比较，以检查 string 而不进行显式计数:

You can compare IndexOf to LastIndexOf to check if there is more than one specific character in a string without explicit counting:

var s = "12121.23.2";
var ch = '.';
if (s.IndexOf(ch) != s.LastIndexOf(ch)) {
    ...
}

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