How to handle special character escaping using Java regular expressions
正则需要转义字符
'$', '(', ')', '*', '+', '.', '[', ']', '?', '\\', '^', '{', '}', '|'
异常现象:
java.util.regex.PatternSyntaxException: Dangling meta. character '*' near index 0
解决方法
对特殊字符加\\转义即可。
注意:虽然使用[]在部分条件下也可以,但是在对于(、[、{范围边界开始符不匹配的情况下会报如下:
异常现象
java.util.regex.PatternSyntaxException: Illegal repetition near index 50
Java过滤正则表达式特殊字代码如下(注意:\\需要第一个替换,否则replace方法替换时会有逻辑bug)
/** * 转义正则特殊字符 ($()*+.[]?\^{},|) * * @param keyword * @return */ public static String escapeExprSpecialWord(String keyword) { if (StringUtils.isNotBlank(keyword)) { String[] fbsArr = { "\\", "$", "(", ")", "*", "+", ".", "[", "]", "?", "^", "{", "}", "|" }; for (String key : fbsArr) { if (keyword.contains(key)) { keyword = keyword.replace(key, "\\" + key); } } } return keyword; }
总结
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