如何在 PHP 中使用正規表示式有效刪除空白行？

Removing Blank Lines in PHP

You've encountered a challenge in removing blank lines from PHP text using regular expressions. The regular expressions you attempted have not yielded the desired results, leaving you with unwanted white space in the output.

To effectively remove blank lines, you can utilize the following regular expression:

<code class="php">preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $string);</code>

This regular expression thoroughly analyzes the text:

• 1st Capturing Group:

  • ^[\r\n]* - Matches lines starting with white space or empty lines.
  • [\r\n]+ - Matches consecutive new line characters.
• [\s\t]*: Matches any white space (spaces or tabs).
• [\r\n]+: Matches consecutive new line characters again.

By using this regular expression, you can condense multiple blank lines, white space-only lines, or a combination of both into a single new line character. This gives you the desired result of removing all blank lines from your PHP text.

以上是如何在 PHP 中使用正規表示式有效刪除空白行？的詳細內容。更多資訊請關注PHP中文網其他相關文章！