Question

首先我这样做了 -

String str = "{\"hits\":[{\"links_count\":6,\"forum_count\":11}],\"totalHitCount\":1}";

        Assert.assertTrue(str.matches("{\"hits\":[{\"links_count\":[0-9]{1,},\"forum_count   \":11}],\"totalHitCount\":[0-9]{1,}}"),
            "Partnership message does not appear");

这让我跟着错误 -

 Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repetition
{"hits":[\{"links_count":[0-9]{1,},"forum_count":11}],"totalHitCount":[0-9]{1,}}

然后我做了（逃避“{”） -

String str = "\\{\"hits\":[\\{\"links_count\":6,\"forum_count\":11\\}],\"totalHitCount\":1\\}";

    Assert.assertTrue(str.matches("\\{\"hits\":[\\{\"links_count\":[0-9]{1,},\"forum_count\":11\\}],\"totalHitCount\":[0-9]{1,}\\}"),
            "Partnership message does not appear");

并收到以下错误 -

Exception in thread "main" java.lang.AssertionError: Partnership message does not appear expected:<true> but was:<false>

我在这里缺少什么？

Answer 1

您无需在输入中转义{ [。但是你需要在你的正则表达式中逃避[ ]。

试试这个：

String str = "{\"hits\":[{\"links_count\":6,\"forum_count\":11}],\"totalHitCount\":1}";

System.out.println(str.matches("\\{\"hits\":\\[\\{\"links_count\":[0-9]{1,},\"forum_count\":11\\}\\],\"totalHitCount\":[0-9]{1,}\\}"));

Answer 2

你在正则表达式（matches("...")中的字符串）中转义花括号是正确的，否则它们会被解释为模式重复。

然而，你不应该逃避str内部的花括号，因为这只会破坏你的情况。

在调试Java正则表达式时，您可能会发现这个很好的online tool。

Answer 3

正确的正则表达式是：

str.matches("\\{\"hits\":\\[\\{\"links_count\":[0-9]+,\"forum_count\":[0-9]+\\}\\],\"totalHitCount\":[0-9]+\\}")

Answer 4

你错过了方括号[]

String str = "{\"hits\":[{\"links_count\":6,\"forum_count\":11}],\"totalHitCount\":1}";

这将返回true

Assert.assertTrue(str.matches("\\{\"hits\":\\[\\{\"links_count\":[0-9]{1,},\"forum_count\":11\\}\\],\"totalHitCount\":[0-9]{1,}\\}"),"Partnership message does not appear");

具有“{”的字符串的模式匹配

4 个答案: