Question

我正在编写代码来检测文件中的错误关键字。以下是我遵循的步骤：

使用StreamTokenizer进行令牌化

使用模式匹配器查找匹配项

while(streamTokenizer.nextToken() != StreamTokenizer.TT_EOF){
            if(streamTokenizer.ttype == StreamTokenizer.TT_WORD) {
                String token = streamTokenizer.sval.trim().replaceAll("\\\\n", "")
                final Matcher matcher = badKeywordPattern.matcher(token)
                if(matcher.find()) { // bad tokens found
                     return true;
                }
            }
}

String token = streamTokenizer.sval.trim().replaceAll("\\\\n", "")以匹配使用\跨越多行的令牌。例如：

bad\ token

然而，替换不起作用。有什么建议？还有其他方法吗？

Answer 1

假设您要删除位于该行末尾的所有replaceAll("\\\\\\R","")以及行分隔符，您可以使用\。

要在正则表达式中表示replaceAll（\使用的是{}}，我们需要使用另一个\\来转义它，这会留下\。但是由于"\\\\"在字符串文字中也很特殊，我们需要使用另一个反斜杠再次转义它们，这使我们留下\R
从Java 8开始，我们可以使用"\\R"（需要将\写成\r，因为\n需要转义）来表示行分隔符，例如\r\n {{ 1}}或private void createOneToMany(OntModel ontoModel, OntClass ontoClass, OntProperty prop, Resource resource) { OntClass allValuesFromRestriction = ontoModel.createAllValuesFromRestriction(null, prop, resource); ontoClass.addSuperClass(allValuesFromRestriction); OntClass minCardinalityRestriction = ontoModel.createMinCardinalityRestriction(null, prop, 1); ontoClass.addSuperClass(minCardinalityRestriction); } private void createZeroToMany(OntModel ontoModel, OntClass ontoClass, OntProperty prop, Resource resource) { OntClass allValuesFromRestriction = ontoModel.createAllValuesFromRestriction(null, prop, resource); ontoClass.addSuperClass(allValuesFromRestriction); OntClass minCardinalityRestriction = ontoModel.createMinCardinalityRestriction(null, prop, 0); ontoClass.addSuperClass(minCardinalityRestriction); } private void createZeroToOne(OntModel ontoModel, OntClass ontoClass1, OntProperty prop, OntClass ontoClass2) { OntClass minCardinalityRestriction = ontoModel.createMinCardinalityRestriction(null, prop, 0); ontoClass1.addSuperClass(minCardinalityRestriction); OntClass maxCardinalityRestriction = ontoModel.createMaxCardinalityRestriction(null, prop, 1); ontoClass1.addSuperClass(maxCardinalityRestriction); } private void createOneToOne(OntModel ontoModel, OntClass ontoClass1, OntProperty prop, OntClass ontoClass2) { OntClass minCardinalityRestriction = ontoModel.createMinCardinalityRestriction(null, prop, 1); ontoClass1.addSuperClass(minCardinalityRestriction); OntClass maxCardinalityRestriction = ontoModel.createMaxCardinalityRestriction(null, prop, 1); ontoClass1.addSuperClass(maxCardinalityRestriction); }对。

Answer 2

如果我理解正确，你不想使用正则表达式（这是String.replaceAll所做的），只需用String.replace替换文字字符串，并使用少一个反斜杠：

String token = streamTokenizer.sval.trim().replace("\\\n", "")

Answer 3

基于@Pshemo answer，向您展示\＆amp; \n在正则表达式中呈现，如上所述here。你可以这样做：

String[] tkns = streamTokenizer.sval.trim().split("\\\\\\R"); // yourString = "bad\\\ntaken"
StringBuffer token= new StringBuffer();
for (String tkn : tkns)
{
    token.append(tkn);
    //System.out.println(tkn);
}
//final Matcher matcher = badKeywordPattern.matcher(token)

在java中替换\和换行替换

3 个答案: