Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 解决方法: 要对切割字符进行转义\\

使用str.split("[",15)时，出现Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^的问题

解决办法为在[加上\\转义

str.split("\\[",15)