如何在Lucene中编写正则表达式模式? [英] How to write regex pattern in lucene?

问题描述

我想在Lucene中匹配来自正则表达式查询的字符串.

I want to match a string from regexp query in lucene.

测试字符串:

       program-id.  acinstal.

Java中的正则表达式模式:

Regex pattern in java:

^[a-z0-9 ]{6}[^*]\s*(program-id)\.

我将如何专门为lucene regexp查询编写此正则表达式以匹配字符串.

How would i write this regex specifically for lucene regexp query to match the string.

推荐答案

正则表达式的两个问题(假设基于前面的问题，这里的测试字符串被索引而没有任何标记化.例如，作为StringField) :

Two problems with your regex (assuming here, based on previous questions, that your test string is indexed without any tokenization. As a StringField, for instance):

1. 正则表达式必须匹配整个术语.正如我们假设的那样，如果不进行任何分析，则意味着它必须与整个字段匹配.在这种情况下，您需要添加.*来匹配其余字段

1. The regex must match a whole term. Without any analysis, as we're assuming, that means it must match the whole field. In this case, you need to add a .* to match the rest of the field

由于您仍然必须匹配整个字段，因此不支持锚，因此请一开始就删除^.

Since you have to match the whole field anyway, anchors are not supported, so get rid of the ^ at the beginning.

所以应该起作用的正则表达式是:

So the regex that should work is:

[a-z0-9 ]{6}[^*]\s*(program-id)\..*

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