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Question

我会把它放在那里：我对正则表达式很糟糕。我试图想出一个来解决我的问题，但我真的不太了解它们。。

想象一下以下几句话：

你好，等等。它大概是11 1/2“x 32”。

尺寸为8 x 10-3 / 5！

可能在22“x 17”的某个地方。

卷很大：42 1/2“x 60码。

它们都是5.76乘8帧。

是的，也许它长约84厘米。

我想13/19“。

不，实际上可能是86厘米。

我希望尽可能干净地从这些句子中提取项目维度。在完美的世界中，正则表达式将输出以下内容：

11 1/2“x 32”

8 x 10-3 / 5

22“x 17”

42 1/2“x 60 yd

5.76 by 8

84厘米

13/19"

86 cm

我想象一个适用以下规则的世界：

以下是有效单位：{cm, mm, yd, yards, ", ', feet}，但我更倾向于考虑任意一组单位的解决方案，而不是上述单位的明确解决方案。
维度始终以数字形式描述，可能有也可能没有跟随它的单位，可能有也可能没有小数或小数部分。允许由它自己组成一个小数部分，例如4/5"。
小数部分总是有一个/分隔分子/分母，人们可以假设各部分之间没有空间（尽管如果有人认为那个很好！）。
尺寸可以是一维的或二维的，在这种情况下，可以假定以下两个尺寸可以接受：{x, by}。如果维度只是一维，则必须具有上述集合中的单位，即22 cm是正常的，.333不是，4.33 oz也不是[1-9]+[/ ][x1-9]。

为了向你展示我对正则表达式的无用（并告诉我至少尝试过！），我就这么做了。。

\d+(?:\.\d+)?[\s-]*(?:\d+)?(?:\/\d+)?(?:cm|mm|yd|"|'|feet)(?:\s*x\s*|\s*by\s*)?(?:\d+(?:\.\d+)?[\s*-]*(?:\d+(?:\/\d+)?)?(?:cm|mm|yd|"|'|feet)?)?

更新（2）

你们这些人非常快速有效！我将添加一些以下正则表达式未涵盖的测试用例：

最后一个测试用例是12码x。

最后一个测试用例是99厘米。

这句话没有尺寸：342/5553 / 222。

三维？ 22“x 17”x 12 cm

这是产品代码：c720，其他数字为83 x更好。

一个数字本身就是21。

体积不应与0.332盎司相匹配。

这些应该导致以下结果（＃表示什么都不匹配）：

12码

99 cm

＃

22“x 17”x 12 cm

＃

＃

＃

我已经在下面修改了M42's回答：

{{1}}

但是虽然这解决了一些新的测试用例，但它现在无法匹配以下其他测试用例。它报道：

11 1/2“x 32”PASS

（无）FAIL

22“x 17”PASS

42 1/2“x 60 yd PASS

（无）FAIL

84cm PASS

13/19“PASS

86 cm PASS

22“PASS

（无）FAIL


（无）FAIL



12码x失败


99 cm by FAIL

22“x 17”[并且，但另外'12 cm'] FAIL


PASS



PASS

Answer 1

新版本，靠近目标，2次测试失败

#!/usr/local/bin/perl 
use Modern::Perl;
use Test::More;

my $re1 = qr/\d+(?:\.\d+)?[\s-]*(?:\d+)?(?:\/\d+)?(?:cm|mm|yd|"|'|feet)/;
my $re2 = qr/(?:\s*x\s*|\s*by\s*)/;
my $re3 = qr/\d+(?:\.\d+)?[\s-]*(?:\d+)?(?:\/\d+)?(?:cm|mm|yd|"|'|feet|frames)/;
my @out = (
'11 1/2" x 32"',
'8 x 10-3/5',
'22" x 17"',
'42 1/2" x 60 yd',
'5.76 by 8 frames',
'84cm',
'13/19"',
'86 cm',
'12 yd',
'99 cm',
'no match',
'22" x 17" x 12 cm',
'no match',
'no match',
'no match',
);
my $i = 0;
my $xx = '22" x 17"';
while(<DATA>) {
    chomp;
    if (/($re1(?:$re2$re3)?(?:$re2$re1)?)/) {
        ok($1 eq $out[$i], $1 . ' in ' . $_);
    } else {
        ok($out[$i] eq 'no match', ' got "no match" in '.$_);
    }
    $i++;
}
done_testing;


__DATA__
Hello blah blah. It's around 11 1/2" x 32".
The dimensions are 8 x 10-3/5!
Probably somewhere in the region of 22" x 17".
The roll is quite large: 42 1/2" x 60 yd.
They are all 5.76 by 8 frames.
Yeah, maybe it's around 84cm long.
I think about 13/19".
No, it's probably 86 cm actually.
The last but one test case is 12 yd x.
The last test case is 99 cm by.
This sentence doesn't have dimensions in it: 342 / 5553 / 222.
Three dimensions? 22" x 17" x 12 cm
This is a product code: c720 with another number 83 x better.  
A number on its own 21.
A volume shouldn't match 0.332 oz.

<强>输出：

#   Failed test ' got "no match" in The dimensions are 8 x 10-3/5!'
#   at C:\tests\perl\test6.pl line 42.
#   Failed test ' got "no match" in They are all 5.76 by 8 frames.'
#   at C:\tests\perl\test6.pl line 42.
# Looks like you failed 2 tests of 15.
ok 1 - 11 1/2" x 32" in Hello blah blah. It's around 11 1/2" x 32".
not ok 2 -  got "no match" in The dimensions are 8 x 10-3/5!
ok 3 - 22" x 17" in Probably somewhere in the region of 22" x 17".
ok 4 - 42 1/2" x 60 yd in The roll is quite large: 42 1/2" x 60 yd.
not ok 5 -  got "no match" in They are all 5.76 by 8 frames.
ok 6 - 84cm in Yeah, maybe it's around 84cm long.
ok 7 - 13/19" in I think about 13/19".
ok 8 - 86 cm in No, it's probably 86 cm actually.
ok 9 - 12 yd in The last but one test case is 12 yd x.
ok 10 - 99 cm in The last test case is 99 cm by.
ok 11 -  got "no match" in This sentence doesn't have dimensions in it: 342 / 5553 / 222.
ok 12 - 22" x 17" x 12 cm in Three dimensions? 22" x 17" x 12 cm
ok 13 -  got "no match" in This is a product code: c720 with another number 83 x better.  
ok 14 -  got "no match" in A number on its own 21.
ok 15 -  got "no match" in A volume shouldn't match 0.332 oz.
1..15

似乎很难匹配5.76 by 8 frames但不匹配0.332 oz，有时您必须将数字与单位和数字匹配，而不是单位。

对不起，我无法做得更好。

Answer 2

许多可能的解决方案之一（应该是nlp兼容的，因为它只使用基本的正则表达式语法）：

foundMatch = Regex.IsMatch(SubjectString, @"\d+(?: |cm|\.|""|/)[\d/""x -]*(?:\b(?:by\s*\d+|cm|yd)\b)?");

会得到你的结果：）

<强>解释

"
\d             # Match a single digit 0..9
   +              # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
(?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
      \           # Match the character “ ” literally
   |              # Or match regular expression number 2 below (attempting the next alternative only if this one fails)
      cm          # Match the characters “cm” literally
   |              # Or match regular expression number 3 below (attempting the next alternative only if this one fails)
      \.          # Match the character “.” literally
   |              # Or match regular expression number 4 below (attempting the next alternative only if this one fails)
      ""          # Match the character “""” literally
   |              # Or match regular expression number 5 below (the entire group fails if this one fails to match)
      /           # Match the character “/” literally
)
[\d/""x -]        # Match a single character present in the list below
                  # A single digit 0..9
                  # One of the characters “/""x”
                  # The character “ ”
                  # The character “-”
   *              # Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
(?:               # Match the regular expression below
   \b             # Assert position at a word boundary
   (?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
         by       # Match the characters “by” literally
         \s       # Match a single character that is a “whitespace character” (spaces, tabs, line breaks, etc.)
            *     # Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
         \d       # Match a single digit 0..9
            +     # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
      |           # Or match regular expression number 2 below (attempting the next alternative only if this one fails)
         cm       # Match the characters “cm” literally
      |           # Or match regular expression number 3 below (the entire group fails if this one fails to match)
         yd       # Match the characters “yd” literally
   )
   \b             # Assert position at a word boundary
)?                # Between zero and one times, as many times as possible, giving back as needed (greedy)
"

Answer 3

这就是我在'Perl'中使用正则表达式所能得到的。尝试使其适应你的正则表达式风格：

\d.*\d(?:\s+\S+|\S+)

说明：

\d        # One digit.
.*        # Any number of characters.
\d        # One digit. All joined means to find all content between first and last digit.
\s+\S+    # A non-space characters after some space. It tries to match any unit like 'cm' or 'yd'.
|         # Or. Select one of two expressions between parentheses.
\S+       # Any number of non-space characters. It tries to match double-quotes, or units joined to the 
          # last number.

我的测试：

script.pl 的内容：

use warnings;
use strict;

while ( <DATA> ) {
        print qq[$1\n] if m/(\d.*\d(\s+\S+|\S+))/
}

__DATA__
Hello blah blah. It's around 11 1/2" x 32".
The dimensions are 8 x 10-3/5!
Probably somewhere in the region of 22" x 17".
The roll is quite large: 42 1/2" x 60 yd.
They are all 5.76 by 8 frames.
Yeah, maybe it's around 84cm long.
I think about 13/19".
No, it's probably 86 cm actually.

运行脚本：

perl script.pl

结果：

11 1/2" x 32".
8 x 10-3/5!
22" x 17".
42 1/2" x 60 yd.
5.76 by 8 frames.
84cm
13/19".
86 cm

正则表达式匹配对象尺寸

PASS

PASS

3 个答案: