Bug #74210 [Opn->Nab]: RegExp pattern doesn't match as expected.

Edit report at https://bugs.php.net/bug.php?id=74210&edit=1 ID: 74210 Updated by: requinix@php.net Reported by: grgtvs at gmail dot com Summary: RegExp pattern doesn't match as expected. -Status: Open +Status: Not a bug Type: Bug Package: PCRE related Operating System: Linux kerne; 4.8.0-36-generic PHP Version: 7.0.16 Block user comment: N Private report: N New Comment: PHP 7 introduces PCRE's JIT, which can affect how a regex compiles and matches. http://sljit.sourceforge.net/pcre.html JIT is causing your regex to fail, as shown by the preg_last_error() code: https://3v4l.org/F5A9p This is due to a simple inefficiency in the regex: /{(?:[^{}]|(?R))*}/ ^ Making that character set repeatable removes the problem. https://3v4l.org/OTdvX If all else fails you can disable JIT with pcre.jit=0. https://3v4l.org/Hf2gT Note that your regex can fail if any of the strings contains an unbalanced { }. Decoding the string as JSON is a much better solution. Previous Comments: ------------------------------------------------------------------------ [2017-03-06 11:13:57] grgtvs at gmail dot com Description: ------------ The pattern '/{(?:[^{}]|(?R))*}/' doesn't match anything under php7 (7.0.15) while using php 5.5.9 it matches the message succesfully. Test script: --------------- <?php $re = '/{(?:[^{}]|(?R))*}/'; $str = "{\"message\":\"cURL error 7: Failed to connect to 172.17.0.1 port 3000: Connection refused\",\"trace\":\"#0 /foo/bar/vendor/guzzlehttp/guzzle/src/Adapter/Curl/CurlAdapter.php(112): GuzzleHttp\Event\RequestEvents::emitError(Object(GuzzleHttp\Adapter\Transaction), Object(GuzzleHttp\Exception\AdapterException), Array)\n#1 /foo/bar/vendor/guzzlehttp/guzzle/src/Adapter/Curl/CurlAdapter.php(91): GuzzleHttp\Adapter\Curl\CurlAdapter->handleError(Object(GuzzleHttp\Adapter\Transaction), Array, Resource id #16)\n#2 /foo/bar/vendor/guzzlehttp/guzzle/src/Client.php(193): GuzzleHttp\Adapter\Curl\CurlAdapter->send(Object(GuzzleHttp\Adapter\Transaction))\n#3 /foo/bar/vendor/guzzlehttp/guzzle/src/Client.php(181): GuzzleHttp\Client->send(Object(GuzzleHttp\Message\Request))\n#4 /foo/bar/components/react/react.php(176): GuzzleHttp\Client->post('/project/666...', Array)\n#5 /foo/bar/components/react/react.php(136): react->rendererQuery('project', '{}', Array)\n#6 /foo/bar/controllers/Pro! jectController.php(50): react->render('project')\n#7 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(4126): ProjectController->actionIndex()\n#8 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3639): CInlineAction->runWithParams(Array)\n#9 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6815): CController->runAction(Object(CInlineAction))\n#10 /foo/bar/components/Controller.php(578): CFilterChain->run()\n#11 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): Controller->filterEnsureSSL(Object(CFilterChain))\n#12 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter->filter(Object(CFilterChain))\n#13 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6824): CFilterChain->run()\n#14 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(4017): CFilter->filter(Object(CFilterChain))\n#15 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): CController->filterAccessControl(Object(CFilterChain))\n#16 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter-! >filter(Object(CFilterChain))\n#17 /foo/bar/components/Control! ler.php(258): CFilterChain->run()\n#18 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): Controller->filterEnsureCanonicalHost(Object(CFilterChain))\n#19 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter->filter(Object(CFilterChain))\n#20 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3629): CFilterChain->run()\n#21 /foo/bar/components/Controller.php(357): CController->runActionWithFilters(Object(CInlineAction), Array)\n#22 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3614): Controller->runActionWithFilters(Object(CInlineAction), Array)\n#23 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1761): CController->run('index')\n#24 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1681): CWebApplication->runController('project/index')\n#25 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1202): CWebApplication->processRequest()\n#26 /foo/bar/www/index.php(18): CApplication->run()\n#27 {main}\",\"json_encoded\":true}"; preg_match($re, $str, $matches); // Print the entire match result print_r($matches); Expected result: ---------------- Array ( [0] => {"message":"cURL error 7: Failed to connect to 172.17.0.1 port 3000: Connection refused","trace":"#0 /foo/bar/vendor/guzzlehttp/guzzle/src/Adapter/Curl/CurlAdapter.php(112): GuzzleHttp\Event\RequestEvents::emitError(Object(GuzzleHttp\Adapter\Transaction), Object(GuzzleHttp\Exception\AdapterException), Array) #1 /foo/bar/vendor/guzzlehttp/guzzle/src/Adapter/Curl/CurlAdapter.php(91): GuzzleHttp\Adapter\Curl\CurlAdapter->handleError(Object(GuzzleHttp\Adapter\Transaction), Array, Resource id #16) #2 /foo/bar/vendor/guzzlehttp/guzzle/src/Client.php(193): GuzzleHttp\Adapter\Curl\CurlAdapter->send(Object(GuzzleHttp\Adapter\Transaction)) #3 /foo/bar/vendor/guzzlehttp/guzzle/src/Client.php(181): GuzzleHttp\Client->send(Object(GuzzleHttp\Message\Request)) #4 /foo/bar/components/react/react.php(176): GuzzleHttp\Client->post('/project/666...', Array) #5 /foo/bar/components/react/react.php(136): react->rendererQuery('project', '{}', Array) #6 /foo/bar/controllers/ProjectController.php(50): react->render('project') #7 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(4126): ProjectController->actionIndex() #8 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3639): CInlineAction->runWithParams(Array) #9 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6815): CController->runAction(Object(CInlineAction)) #10 /foo/bar/components/Controller.php(578): CFilterChain->run() #11 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): Controller->filterEnsureSSL(Object(CFilterChain)) #12 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter->filter(Object(CFilterChain)) #13 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6824): CFilterChain->run() #14 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(4017): CFilter->filter(Object(CFilterChain)) #15 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): CController->filterAccessControl(Object(CFilterChain)) #16 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter->filter(Object(CFilterChain)) #17 /foo/bar/components/Controller.php(258): CFilterChain->run() #18 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6857): Controller->filterEnsureCanonicalHost(Object(CFilterChain)) #19 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(6812): CInlineFilter->filter(Object(CFilterChain)) #20 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3629): CFilterChain->run() #21 /foo/bar/components/Controller.php(357): CController->runActionWithFilters(Object(CInlineAction), Array) #22 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(3614): Controller->runActionWithFilters(Object(CInlineAction), Array) #23 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1761): CController->run('index') #24 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1681): CWebApplication->runController('project/index') #25 /foo/bar/lib/pph-yii-repo/framework/yiilite.php(1202): CWebApplication->processRequest() #26 /foo/bar/www/index.php(18): CApplication->run() #27 {main}","json_encoded":true} ) Actual result: -------------- Array ( ) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74210&edit=1