PHP regular expression efficiency greedy, non-greedy and backtracking analysis (recommended)

$str = preg_replace(&#39;%<script>.+?</script>%i&#39;,&#39;&#39;,$str);//非贪婪

$str = &#39;<script<script>alert(document.cookie)</script>>alert(document.cookie)</script>&#39;;

$str = &#39;<script<script>alert(document.cookie)</script>>alert(document.cookie)</script>&#39;;

$str = preg_replace(&#39;%<script>.+?</script>%i&#39;,&#39;&#39;,$str);//非贪婪

print_r($str);

//$str 输出为 <script>alert(document.cookie)</script>

$str = &#39;<script<script>alert(document.cookie)</script>>alert(document.cookie)</script>&#39;;

$str = preg_replace('%<script>.+</script>%i','',$str);//非贪婪

print_r($str);

//$str 输出为 <script 只有这些了，好像还是不太合适，哈，您知道如何重写那个正则吗？<="" pre=""><div class="contentsignin">Copy after login</div></div><p> </p><p></p><p> The above is an introduction to the difference between greedy and non-greedy. Next, let’s talk about backtracking problems caused by greed and non-greed. Let’s look at a small example first. </p><p>The regular expression is \w*(\d+), and the string is cfc456n. Then, what is the $1 matched by this regular expression? ? </p><p>If your answer is 456, then congratulations, your answer is wrong. The result is not 456, but 6. Do you know why? </p><p>CFC4N will explain that when the regular engine uses regular \w*(\d+) to match the string cfc456n, it will first use \w* to match the string cfc456n. First, \w* will match the character All the characters in the string cfc456n are then handed over to \d+ to match the remaining string, and the rest is gone. At this time, the \w* rule will reluctantly spit out a character for \d+ to match. At the same time, Before spitting out characters, record a point. This point is the point used for backtracking. Then \d+ matches n. If it is found that the match cannot be successful, \w* will be asked to spit out another character again. \w* will record it again first. A point to backtrack and spit out one more character. At this time, the matching result of \w* is only cfc45, and 6n has been spit out. \d+ matches 6 again. If it is found that the match is successful, the engine will be notified that the match is successful, and it will be displayed directly. Therefore, the result of (\d+) is 6, not 456. </p><p>When the above regular expression is changed to \w*?(\d+) (note that this is non-greedy), the string is still cfc456n. So, at this time, what is the $1 of the regular match? ? </p><p>Student A answered: The result is 456. </p><p>Well, yes, correct, it is 456. CFC4N would like to ask, why is it 456? </p><p>Let me explain why it is 456</p><p>There is a rule in regular expressions that quantifiers are matched first, so \w*? will match the string cfc456 first, because \w*? Whether greedy or not, the regular engine will use the expression \w+? to only match one string at a time, and then transfer control to the following \d+ to match the next character. At the same time, it will record a point for unsuccessful matching. At this time, return here and match again, which is the backtracking point. Since \w is followed by the quantifier *, * represents 0 to countless times, so the first is 0 times, that is, \w*? matches an empty space, records the traceback point, and hands control to \d+,\d+ to match cfc456n The first character c of , then, the matching fails, so the control is handed over to \w*? to match the c of cfc456n, \w*? matches c successfully, because it is not greedy, so it only matches each time A character, record the traceback point, and then give control to \d+match f, then, \d+ match f and fail again, then give control to \w*?, \w*? then match c, record the traceback point ( At this time \w*? The matching result is cfc), and then give control to \d+, \d+ matches 4, and the match is successful. Then, since the quantifier is +, it is 1 to countless times, so it continues to match, Match 5 again, success, then match 6 again, success, then continue the matching operation, the next character is n, the match fails, at this time, \d+ will hand over the control. Since there is no regular expression after \d+, the entire regular expression is declared to be matched, and the result is cfc456, of which the first set of results is 456. Dear classmate, do you understand the result of the question just now, why is it 456? </p><p>Okay, have you understood the principles of greedy and non-greedy matching from the above example? Do you understand when you need to use greedy or non-greedy to process your string? <br/></p><p> Brother Bird’s article talks about expressions and programs as </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>$reg = "/<script>.*?<\/script>/is";

$str = "<script>********</script>"; //长度大于100014

$ret = preg_repalce($reg, "", $str); //返回NULL</pre><div class="contentsignin">Copy after login</div></div><p> </p><p></p><p>The reason is that there are too many backtrackings until Causes exhaustion of stack space and stack explosion. </p><p>Let’s look at another example. </p><p>String</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>$str = &#39;<script>123456</script>&#39;;</pre><div class="contentsignin">Copy after login</div></div><p> </p><p></p><p>The regular expression is </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>$strRegex1 = &#39;%<script>.+<\/script>%&#39;;

$strRegex2 = &#39;%<script>.+?<\/script>%&#39;;

$strRegex3 = &#39;%<script>(?:(?!<\/script>).)+<\/script>%&#39;;</pre><div class="contentsignin">Copy after login</div></div><p> </p>

<p></p>

<p> The above is the greedy, non-greedy and backtracking analysis of PHP regular expression efficiency introduced by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website! </p>

<p>For more PHP regular expression efficiency, greedy, non-greedy and backtracking analysis (recommended) related articles, please pay attention to the PHP Chinese website! </p>

<p><br></p>

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                                    <a href="https://www.php.cn/faq/java-tutorial" title="Java Tutorial" class="phpgenera_Details_mainR4_bottom_title">Java Tutorial</a>

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