#Grep options not pattern manual#
Here, the problem is that preg_match does not return boolean(false) as expected by the description / manual of above. On one of our Windows-Servers the above example does not crash PHP, but (directly) hits the recursion-limit. It wraps the possibly crashing preg_match call by decreasing the PCRE recursion limit in order to result in a Reg-Exp error instead of a PHP-crash. If you are looking for a work-around, the following code-snippet is what I found helpful. This seems to be a known bug (see ), but I don't know if it has been fixed, yet. On one of our Linux-Servers the above example crashes PHP-execution with a C(?) Segmentation Fault(!).
![grep options not pattern grep options not pattern](https://www.guyhowto.com/wp-content/uploads/2020/09/Linix-logo.jpg)
In most cases, the following example will show one of two PHP-bugs discovered with preg_match depending on your PHP-version and configuration.
![grep options not pattern grep options not pattern](https://www.computernetworkingnotes.org/images/linux/rhce-study-guide/rsg14-08-before-and-after-pattern-lines.png)
![grep options not pattern grep options not pattern](https://www.computerhope.com/unix/images/grep-tutorial-05.jpg)
Matching a backslash character can be confusing, because double escaping is needed in the pattern: first for PHP, second for the regex engine
#Grep options not pattern archive#
Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search