使用Ant，查找文件匹配正前pression和搜索如果present一个子文件中 [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个文件目录：

I have a directory containing 2 files:

abc_2010-14-12.log

abc_2010-14-12.log

abcdef.log

abcdef.log

我要搜索的第一个文件中的字符串。但我不知道确切的文件名，因为它已经时间戳追加到它。我想我会在文件名中使用常规的前pression。

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。您可能能够做到这一点使用的是正常的文件集包括：

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" />

如果有可能给你​​一个假阳性的东西像'abc_XXXX-YY-ZZ.log'，那么你可以使用的 文件名 选择，它在包括和排除规则提供更强大的匹配比'水珠'通配符：

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>

您也许能够进一步限制，假设（根据你的例子）YYYY-MM-DD：

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"/>

这会给你相匹配的文件集，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present - 说好几天的日志文件 - 你需要决定你想要哪一个。你可以利用 TSTAMP 的任务准确指定基于当前日期的文件名，而不是使用图案匹配或水珠。这个例子获取与昨天的日期的文件，符合格式为：

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" />

一旦你已经确定了文件，您可以使用 resourcecontains 条件设置属性，如果文件匹配 - 在这种情况下，我们搜索找我

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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