PHP Chinese regular matching and replacement examples

PHP Chinese regular matching and replacement examples

Regular expressions are widely used in string matching and replacement operations in PHP, which can achieve high efficiency for Chinese text deal with. This article will introduce through examples how to use Chinese regular expressions for matching and replacement in PHP.

Regular expression basics

In PHP, when using regular expressions to match and replace, the preg_match() function is usually used for matching, preg_replace () function is used for replacement. Some common syntax in regular expressions:

• ##.: matches any character
• *: matches the previous character 0 times or Multiple times
• : Match the previous character at least 1 time
• ?: Match the previous character 0 or 1 times
• []: Matches any character within square brackets
• (): Captures the matching subpattern
• d : Match numbers
• w: Match word characters
• s: Match blank characters

Chinese regular matching example

Suppose we have a string containing Chinese characters, and we want to match all Chinese characters in it. You can use the following regular expression:

$content = "这是一个包含中文字符的字符串";
preg_match_all('/[x{4e00}-x{9fa5}]+/u', $content, $matches);
print_r($matches[0]);

In the above code,

/[x{4e00}-x{9fa5}] /u means matching all Chinese characters. After execution, print_r($matches[0]) will output all matched Chinese characters.

Chinese regular replacement example

If we want to replace all Chinese characters in the string with specified characters, we can use the

preg_replace() function. The sample code is as follows:

$content = "这是一个包含中文字符的字符串";
$newContent = preg_replace('/[x{4e00}-x{9fa5}]+/u', '*', $content);
echo $newContent;

In the above code,

preg_replace('/[x{4e00}-x{9fa5}] /u', '*', $content) will All Chinese characters are replaced with *, and the replaced string is finally output.

Other regular operations

In addition to basic Chinese regular matching and replacement, regular expressions can also be used for more complex operations, such as removing punctuation marks, matching mobile phone numbers, etc. The following is an example:

$content = "这是一个包含标点符号的句子，你的手机号码是13612345678。";
$cleanedContent = preg_replace('/[[:punct:]]/', '', $content);
preg_match('/1[3456789]d{9}/', $cleanedContent, $matches);
echo $matches[0];

The above code first removes the punctuation marks in the string through

preg_replace(), and then matches the mobile phone number through preg_match() and output.

Conclusion

Through the examples in this article, I hope readers will have a deeper understanding of PHP Chinese regular matching and replacement. In actual projects, the flexible use of regular expressions can help us process Chinese text efficiently and improve the readability and maintainability of the code. I hope this article is helpful to readers, thank you for reading!

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