正则表达式在 . , : 字符（和一些例外）

Question

关于.,,,: 符号的正确用法，我需要规范一些文本（产品描述）（前后没有空格） p>

我想出的正则表达式是这样的：

$variation['DESCRIPTION'] = preg_replace('#\s*([:,.])\s*(?!<br />)#', '$1 ', $variation['DESCRIPTION']);

问题在于这匹配了它不应该涉及的四种情况：

• 任何十进制数，例如 5.5
• 任何千位分隔符，例如 4,500
• 希腊语中的“固定”短语ό,τι
• 省略号符号... - 基本上省略号是一个完全特殊的情况，我认为应该在单独的preg_replace 中处理它，也许？我的意思是，这三个点应该被视为一件事，这意味着some text ... 确实应该匹配并转换为some text...，而不是some text. . .

特别是对于数字异常，我知道可以通过一些负面的前瞻/后视来实现，但不幸的是我无法将它们组合到我当前的模式中。

This 是一个供你检查的小提琴（不应该匹配的情况在第 2、3、4 行）。

编辑：下面发布的两种解决方案都可以正常工作，但最终会在描述的最后一个句号之后添加一个空格。这不是什么大问题，因为在我的代码前面，我在描述的开头和结尾处理了<br />s 和 空格，所以我将这个 preg_replace 移到那个之前...

所以，我最终使用的最终代码是这样的：

$variation['DESCRIPTION'] = preg_replace('#\s*([:,.])(?!(?<=\d.)\d)(?!(?<=ό,)τι)\s*#ui', '$1 ', $variation['DESCRIPTION']);
$variation['DESCRIPTION'] = preg_replace('#^\s*(<br />)*\s*|\s*(<br />)*\s*$#', '', $variation['DESCRIPTION']);

所以剩下的唯一事情就是改变这段代码，让它按照我上面描述的方式处理省略号。

非常感谢您对最后一个要求的任何帮助！ TIA

Answer 1

你可以添加两个包含lookbehinds的lookaheads：

\s*(\.{2,}|[:,.](?!(?<=ό,)τι)(?!(?<=\d.)\d))(?!\s*<br\s*/>)\s*

请参阅regex demo。请注意，如果在:、, 或 . 之后的任何零个或多个空格后有 <br/>，我还将\s* 添加到最后一个前瞻中并将其与消耗的\s* 交换以失败匹配.

详情

• \s* - 零个或多个空格
• (\.{2,}|[:,.]) - 第 1 组：两个或多个点，或 :、, 或 .
• (?!(?<=ό,)τι) - 如果接下来的两个字符是 τι 前面有 ό,，则匹配失败
• (?!(?<=\d.)\d) - 如果下一个字符是前面有数字和任何字符的数字，则匹配失败（请注意，. 就足够了，因为 [:,.] 已经匹配允许/必需的字符，在这里，我们只需要“跳过”匹配的字符）
• (?!\s*<br\s*/>) - 如果有零个或多个空格<br、零个或多个空格、/> 紧邻当前位置的右侧，则否定前瞻匹配失败。
• \s* - 零个或多个空格。

Answer 2

如果 Wiktor 的重环顾模式对您来说太难以概念化/维护/适应，那么也许匹配&忽略技术对您来说会更容易。诚然，Wiktor 的模式针对性能进行了优化。

图案：

~                        #starting pattern delimiter 
\s*                      #zero or more whitespaces
(?:                      #start non-capturing group #1
  (?:                    #start non-capturing group #2
    \.\d+                #match float expression not requiring leading digits
    |                    #or
    \d{1,3}(?:,\d{3})+   #match number containing thousands separators
    |                    #or
    ό,τι                 #match literal greek phrase
    |                    #or
    <br\s*/>             #match html break tag
  )                      #end non-capturing group #2
  (*SKIP)(*FAIL)         #discard anything matched by group #2
  |                      #or
  (                      #start capture group #1
    \.{3}                #match three dots as ellipsis
    |                    #or
    [:,.]                #match literal colon, comma, or dot
  )                      #end capture group #1
)                        #end non-capturing group #1
\s*                      #zero or more whitespaces
~                        #ending pattern delimiter

当您希望扩展您的模式以包含更多不合格规则时，只需添加另一个管道并添加一个子模式以匹配不需要的子字符串。

为确保三个符合条件的点作为省略号匹配，请在检查单个字符之前进行匹配。

代码：(Demo)

$text = <<<TEXT
Composition:80% Polyamide,   15% Elastane, 5% Wool.
Side length 50.5 cm <---- THIS SHOULDN'T BE MATCHED
Value 4,500 <---- THIS SHOULDN'T BE MATCHED EITHER

What about $1,234,567.89?
Or....1mm one tenth of a millimeter?

ό,τι<---- THIS IS A FIXED PHRASE IN GREEK AND THEREFORE SHOULDN'T BE MATCHED
Comfort and timeless design characterize the Puma Smash V2 made of suede leather. They can be worn all the time ,being a unique choice for those who want to stand out .Made of rubber.<br />- Softfoam floor<br />- Binding with laces

Specs:<br />&bull; Something<br /><br />&bull; Something else<br />&bull; One more

Children's Form Champion<br /><br />Children's set that will give a comfortable feeling for endless hours of play.<br />It consists of a cardigan and trousers ,made of soft fabric and have rib cuffs and legs for a better fit.<br /><br />&bull; Normal fit<br /><br />&bull; Cardigan  :Rib cuffs, zippers throughout length, high neck, Champion logo <br /> <br />&bull; Pants: Elastic waist with drawstring, ribbed legs, Champion logo. Don't worry,there'll be ...more!
TEXT;

echo preg_replace(
         '~\s*(?:(?:\.\d+|\d{1,3}(?:,\d{3})+|ό,τι|<br\s*/>)(*SKIP)(*FAIL)|(\.{3}|[:,.]))\s*~',
         '$1 ',
         $text
     );

输出：

Composition: 80% Polyamide, 15% Elastane, 5% Wool. Side length 50.5 cm <---- THIS SHOULDN'T BE MATCHED
Value 4,500 <---- THIS SHOULDN'T BE MATCHED EITHER

What about $1,234,567.89?
Or... .1mm one tenth of a millimeter?

ό,τι<---- THIS IS A FIXED PHRASE IN GREEK AND THEREFORE SHOULDN'T BE MATCHED
Comfort and timeless design characterize the Puma Smash V2 made of suede leather. They can be worn all the time, being a unique choice for those who want to stand out. Made of rubber. <br />- Softfoam floor<br />- Binding with laces

Specs: <br />&bull; Something<br /><br />&bull; Something else<br />&bull; One more

Children's Form Champion<br /><br />Children's set that will give a comfortable feeling for endless hours of play. <br />It consists of a cardigan and trousers, made of soft fabric and have rib cuffs and legs for a better fit. <br /><br />&bull; Normal fit<br /><br />&bull; Cardigan: Rib cuffs, zippers throughout length, high neck, Champion logo <br /> <br />&bull; Pants: Elastic waist with drawstring, ribbed legs, Champion logo. Don't worry, there'll be ...more!