spark报错：Caused by: java.util.regex.PatternSyntaxException: Unclosed group near index 1
Spark中使用val rdd2 =rdd.flatMap(_.replaceAll("(","").replaceAll(")",""))报错： 解决方案： 报错的原因是（引起的解决方法很简单，对于字符'(',使用 \\( 或 [(] 即可。 因为在正则表达式中，有个“捕获组”的概念，其使用了小括号；因此分析，当正则表达式解析到左括号时，没有发现对应的右括号，从而报错。
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