


What does isU of preg_match in php mean? preg_matchisu_PHP tutorial
What does isU of preg_match in php mean? preg_matchisu
isU means case split. Here, s does not include newlines and U reverses the number of matches. The value makes it not a default duplication, which is probably the case when we read the article.
/(.*)/isU after the regular expression, what does the "isU" parameter mean?
This is the modifier in regular expressions.
i searches for uppercase and lowercase letters simultaneously,
s is a dot (.) matching all characters, including newlines. If s is not set, newlines are not included.
U reverses the value of the number of matches so that it is not repeated by default, but becomes repeated when followed by "?"
Example
In preg_match compatible regular expression syntax, b represents word boundary
So: The following should be OK? ? ?
$a="test,admin,abc"; $b="te"; $exist=preg_match("/b{$b}b/",$a); if($exist) { echo "存在"; }else { echo "不存在"; }
Look at the relevant instructions
Copy code The code is as follows:
int preg_match ( string pattern, string subject [, array matches [, int flags]] );
preg_match() returns the number of times pattern is matched. Either 0 times (no match) or 1 time, since preg_match() will stop searching after the first match. preg_match_all(), on the contrary, will search until the end of subject. preg_match() returns false on error.
Example:
<?php $a = "abcdefgabcdefaaag"; preg_match('|abc([a-z]+)g|isu',$a,$out1); preg_match_all('|abc([s]+)g|isu',$a,$out2); echo "<pre class="brush:php;toolbar:false">"; print_r($out1); print_r($out2); echo ""; ?>
Writing:
The difference between using double quotes and single quotes
<?php preg_match_all("/href="(.*)"/isu",$contents,$out); preg_match_all('|href="(.*)"|isu',$contents,$out); ?>
The above content is what the editor explains to you about the meaning of isU of preg_match in php. I hope you like it.

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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