java.util.regex.PatternSyntaxException: Unclosed counted closure near index 14 [0-9a-zA-Z]{1, 20}报错

服务器报错

java.util.regex.PatternSyntaxException: Unclosed counted closure near index 14 [0-9a-zA-Z]{1, 20}报错

原因在于{1, 20}之间有一个空格,格式不规范,还是正则表达式不怎么懂。

之前报相似的什么near index .. \\w{1, 20}也是这点的问题。大括号的问题不改还是会报这相同的错。