使用 RegEx 查找字符串中特定文本后的数字 [英] Find numbers after specific text in a string with RegEx

问题描述

我有一个如下所示的多行字符串:

I have a multiline string like the following:

2012-15-08 07:04 Bla bla bla blup
2012-15-08 07:05 *** Error importing row no. 5: The import of this line failed because bla bla
2012-15-08 07:05 Another text that I don't want to search...
2012-15-08 07:06 Another text that I don't want to search...
2012-15-08 07:06 *** Error importing row no. 5: The import of this line failed because bla bla
2012-15-08 07:07 Import has finished bla bla

我想要的是在正则表达式(使用 PowerShell)的帮助下提取所有有错误的行号.所以我需要找到*** Error importing row no."和下面的:"之间的数字，因为这总是会给我行号.

What I want is to extract all row numbers that have errors with the help of RegularExpression (with PowerShell). So I need to find the number between "*** Error importing row no. " and the following ":" as this will always give me the row number.

我查看了其他各种 RegEx 问题，但说实话，答案对我来说就像中文一样.

I looked at various other RegEx question but to be honest the answers are like chinese to me.

尝试在 http://regexr.com/ 的帮助下构建 RegEx，但到目前为止还没有成功，例如使用以下模式:

Tried to built RegEx with help of http://regexr.com/ but haven't been successful so far, for example with the following pattern:

"Error importing row no. "(.?)":"

有什么提示吗?

推荐答案

试试这个表达式:

"Error importing row no\. (\d+):"

演示

这里需要了解量词和转义序列:

Here you need to understand the quantifiers and escaped sequences:

• . 任意字符；由于您只需要数字，请使用 \d;如果您指的是句点字符，则必须使用反斜杠 (\.) 将其转义
• ? 零个或一个字符；这不是您想要的，因为您可以在第 10 行出现错误，并且只取1"
• + 一个或多个；这对我们来说就足够了
• * 任意字符数；与 .* 一起使用时，您必须小心，因为它会消耗您的整个输入

• . any character; as you want only numbers, use \d; if you meant the period character you must escape it with a backslash (\.)
• ? Zero or one character; this isn't what do you want, as you can here an error on line 10 and would take only the "1"
• + One or many; this will suffice for us
• * Any character count; you must take care when using this with .* as it can consume your entire input

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