java异常[java.util.regex.patternsyntaxexception dangling meta character ‘+‘ near index]解决

java异常[java.util.regex.patternsyntaxexception dangling meta character '+' near index]解决

String s="/babalaautomgr.ejs?method=constr";
int i=s.split("?").length;
System.out.println(i);

java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 0

问题出现在加号附近，查询相关的资料显示，+、*、|、\等符号在正则表达示中有相应的不同意义。
一般来讲只需要加[]、或是\\即可

String[] nqian = newqian.split("\\+");

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java异常[java.util.regex.patternsyntaxexception dangling meta character ‘+‘ near index]解决

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