Lucene/Java中\s*、\s+正则不生效，代码空格无法移除求助

我正在使用Java结合Lucene开发代码分析器，希望移除空白字符以实现代码规范化，但发现\s*和\s+正则表达式无法被识别。

原实现代码 #

Analyzer ana = CustomAnalyzer.builder(Paths.get("."))
    .addCharFilter("patternreplace","pattern","[{]|[}]|[;]|[,]|[(]|[)]","replacement","")
    .withTokenizer(SimplePatternSplitTokenizerFactory.class,"pattern","[\n]") 
    .addTokenFilter(LowerCaseFilterFactory.class)
    .addTokenFilter("patternreplace","pattern","[jlk][+][+]","replacement","i++")
    .addTokenFilter("patternreplace","pattern","size","replacement","length")
    .addTokenFilter("patternreplace","pattern","[\\s*][jkl][\\s*]","replacement"," i ")
    .addTokenFilter("patternreplace","pattern","[\\s+]","replacement","")
    .build();
return muestraTexto(ana, texto);

测试用例代码 #

for(int i = 0; i < nada.size(); i++){
    suma = 5 + 3;
}


    for(int j = 0; j < algo.size(); j++){
    suma2 = 5+3;
}

当前输出结果 #

forint i = 0 i < nada.length i
suma = 5  3

forint j = 0 j < algo.length i
    suma2 = 53

目前空格并未被成功移除，请求解决该问题。

问题核心是正则表达式写法错误：方括号[]是字符类，里面的*和+会被当作普通字符处理，而非量词，导致正则完全达不到预期效果。以下是具体修正方案：

1. 修正空白匹配正则 #

• 将匹配jkl前后空白的正则[\\s*][jkl][\\s*]改为\\s*[jkl]\\s*：去掉方括号，让*作为量词匹配零个或多个空白字符。
• 将移除空白的正则[\\s+]改为\\s+：去掉方括号，让+作为量词匹配一个或多个空白字符，替换为空即可移除所有连续空白。

2. 调整Filter顺序（推荐） #

把移除空白的Filter放在最后，确保前面所有替换操作引入的空白都能被统一处理。

修正后的完整代码 #

Analyzer ana = CustomAnalyzer.builder(Paths.get("."))
    .addCharFilter("patternreplace","pattern","[{]|[}]|[;]|[,]|[(]|[)]","replacement","")
    .withTokenizer(SimplePatternSplitTokenizerFactory.class,"pattern","[\n]") 
    .addTokenFilter(LowerCaseFilterFactory.class)
    .addTokenFilter("patternreplace","pattern","[jlk][+][+]","replacement","i++")
    .addTokenFilter("patternreplace","pattern","size","replacement","length")
    .addTokenFilter("patternreplace","pattern","\\s*[jkl]\\s*","replacement"," i ")
    .addTokenFilter("patternreplace","pattern","\\s+","replacement","")
    .build();
return muestraTexto(ana, texto);

修正后预期输出 #

forinti=0i<nada.lengthi
suma=53

forinti=0i<algo.lengthi
suma2=53

内容的提问来源于stack exchange，提问作者leyva_7