使用 ant，查找与正则表达式匹配的文件并搜索文件中是否存在子字符串 [英] Using ant, find files matching a regular expression and search if a substring in present in the file

问题描述

我有一个包含 2 个文件的目录:

I have a directory containing 2 files:

abc_2010-14-12.log

abc_2010-14-12.log

abcdef.log

我想在第一个文件中搜索子字符串.但我不知道确切的文件名，因为它附加了时间戳.我想我将不得不在文件名中使用正则表达式.

I want to search for a substring in the 1st file. But i dont know the exact file name as it has timestamp appended to it. I think i will have to use regular expression in the file name.

推荐答案

首先你必须确定文件.您可以使用普通的 fileset 包括:

First you must identify the file. You may be able to do that using a normal fileset include:

<fileset dir="." id="the.file" includes="abc_????-??-??.log" />

如果这可能会让您对诸如abc_XXXX-YY-ZZ.log"之类的内容产生误报，那么您可以使用 filename 选择器，它具有比包含和排除规则中可用的glob"通配符更强大的匹配:

If that might give you a false positive on something like 'abc_XXXX-YY-ZZ.log', then you can use a filename selector, which has more powerful matching than the 'glob' wildcarding available in include and exclude rules:

<fileset dir="." id="the.file">
    <filename regex=".*_[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9].log"/>
</fileset>

假设(根据您的示例)YYYY-DD-MM，您可能可以进一步限制:

You might be able to restrict further, assuming (based on your example) YYYY-DD-MM:

<filename regex=".*_20[01][0-9]-[0-3][0-9]-[01][0-9].log"/>

这些将为您提供匹配的文件集，希望只是一个文件.

These will give you a fileset that matches, hopefully just the one file.

如果您有多个匹配的文件 - 比如说几天的日志文件 - 您需要决定需要哪一个.您可以使用 tstamp 任务来准确指定基于当前日期，而不是使用模式匹配或 glob.此示例获取与您的格式匹配的昨天日期的文件:

If you have more than one matching file present - say several days' log files - you'll need to decide which one you want. You could make use of the tstamp task to exactly specify the filename based on the current date, rather than using a pattern match or glob. This example gets the file with yesterday's date, matching your format:

<tstamp>
    <format property="file.date" pattern="yyyy-dd-MM"
            offset="-1" unit="day"/>
</tstamp>
<fileset dir="." id="the.file" includes="abc_${file.date}.log" />

确定文件后，您可以使用resourcecontains如果文件匹配，则设置属性的条件 - 在这种情况下，我们搜索查找我":

Once you have identified the file, you can use the resourcecontains condition to set a property if the file matches - in this case we search for 'look for me':

<condition property="file.matches">
    <resourcecontains refid="the.file" substring="look for me" />
</condition>

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