正则表达式为测量单位两边的值(200g / 200g)

Question

我正在尝试编写一个正则表达式来捕获字符串中的任何测量单位，考虑到该单位可以在数字之前或之后。

我现在想到的是两个正则表达式。

与 匹配的/d*.?,?d+s?(kg|g|l)/gi

ABC 200g
EFG 5,4 Kg
HIL 2x20l

和(kg|g|l)s?d+,?.?d*匹配:

ABC g200
EFG kg 5,4
HIL l 20x2

如何将两个正则表达式连接起来以匹配两者:

ABC g200
EFG 5,4 Kg

Answer 1

对于显示的示例，请尝试以下正则表达式。

(?:(?:(?:d+)g|(?:gd+))|(?:(?:ls*d+)|(?:d+s*l))|(?:(?:d+,d+s*Kg)|(?:kgs*d+,d+)))

正则表达式的在线演示

解释:为以上内容添加详细说明。

(?:                                     ##Starting 1st capturing group from here.
(?:                                   ##Starting 2nd capturing group from here.
(?:d+)g|(?:gd+)                  ##Matching either digits followed by g OR g followed by digits(both conditions in non-capturing groups here).
)                                     ##Closing 2nd capturing group here.
|                                     ##Putting OR condition here.
(?:                                   ##Starting 3rd capturing group here.
(?:ls*d+)|(?:d+s*l)            ##Matching eiter l followed by 0 or more spaces followed by digits OR digits followed by 0 or more spaces followed by l.
)                                     ##Closing 3rd capturing group here.
|                                     ##Putting OR condition here.
(?:                                   ##Starting 4th capturing group here.
(?:d+,d+s*Kg)|(?:kgs*d+,d+)  ##Checking either digits followed by comma digits spaces Kg OR kg spaces digits comma digits here.
)                                     ##Closing 4th capturing group here.
)                                       ##Closing 1st capturing group here.

Answer 2

使用不区分大小写的模式，匹配可选的k和g或l，以及替换的|以另一种方式匹配模式。

可选的点和逗号可以在[.,]?字符类中，否则.?,?也可以像.,一样匹配它们

字边界b防止单元之后的部分匹配。

d*[.,]?d+s*(?:k?g|l)b|b(?:k?g|l)s*d*[.,]?d+

Regex演示