用正则表达式匹配产品尺寸 [英] Match product dimensions with regular expression

问题描述

我正在尝试使用正则表达式匹配长度宽度和高度.

I am trying to match length width and height with a regular expression.

我有以下情况

Artikelgewicht3,7 Kg
Produktabmessungen60,4 x 46,5 x 42 cm

or

Artikelgewicht3,7 Kg
Produktabmessungen60 x 46 x 42

or

Artikelgewicht3,7 Kg
Produktabmessungen60 x 46

第二种情况可以搭配(\d+) x (\d+) x (\d+)，效果很好.

The second case can be matched with (\d+) x (\d+) x (\d+), which works fine.

我进一步尝试将第一种和第三种情况与 (\d+)(\\,\d+)?x (\d+)(\\,\d+)?x (\d+)(\\,\d+)?.

I further tried to match the first and the third case with (\d+)(\\,\d+)? x (\d+)(\\,\d+)? x (\d+)(\\,\d+)?.

任何建议我做错了什么?

Any suggestions what I am doing wrong?

推荐答案

您可以在正则表达式中使用可选匹配来涵盖所有 3 种情况:

You can use optional matches in your regex to cover all 3 cases:

(\d+(?:,\d+)?) x (\d+(?:,\d+)?)(?: x (\d+(?:,\d+)?))?

正则表达式演示

这将在第一个捕获组中给出length，在第二个捕获组中给出width，在第三个捕获组中给出height.

This will give length in 1st capturing group, width in 2nd capturing group and height in 3rd.

每个组都使用这个子表达式:

Each group is using this sub-expression:

(\d+(?:,\d+)?)

1 个或多个数字可选后跟一个逗号和 1 个以上的小数部分.

Which is 1 or more digits optionally followed by a comma and 1+ digits for decimal part.

另外，请注意高度部分是可选匹配，因为我们使用 (?: x (\d+(?:,\d+)?))? 使该部分成为可选.

Also, note that height part is an optional match as we're using (?: x (\d+(?:,\d+)?))? to make that part optional.

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