Java 中的字符串模式匹配问题
在我的程序中,当我使用
line.replaceAll("(", "_");
我得到了一个 :RuntimeException
at java.util.regex.Pattern.error(Unknown Source)
at java.util.regex.Pattern.accept(Unknown Source)
at java.util.regex.Pattern.group0(Unknown Source)
at java.util.regex.Pattern.sequence(Unknown Source)
at java.util.regex.Pattern.expr(Unknown Source)
at java.util.regex.Pattern.compile(Unknown Source)
at java.util.regex.Pattern.<init>(Unknown Source)
at java.util.regex.Pattern.compile(Unknown Source)
at java.lang.String.replaceAll(Unknown Source)
at Processing.processEarly(Processing.java:95)
at Processing.main(Processing.java:34)
有什么原因吗?我们怎样才能避免它?