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Informations about the package ereg-shim

php ereg shim

This package emulates the old php extension for POSIX regular expressions (ereg) if it's not available. Internally, the PCRE extension is used to process regular expressions.

Requirements and Usage

The library requires php 5.3 or newer. To add it to your projects, simply add derrabus/ereg-shim to your composer dependencies.

This should auto-register the shim for you. However, it remains inactive as long as the ereg extension is active. It should be safe to include it in projects that should be tested on php 5 and php 7/8 simultaneously.

You can also force the usage of the shim implementation on php 5 by directly calling the corresponding methods on the Rabus\EregShim\Ereg class.

Global function call Forced shimmed function call
ereg('[0-9][^0-9]', '2a') \Rabus\EregShim\Ereg::ereg('[0-9][^0-9]', '2a')

Purpose and limitations

This library can be helpful if you need to quicky migrate a legacy codebase to php 7.0 and beyond. It will be slower than the native implementation and is not intended to be a permanent solution. Code that depends on the ereg extension should be refactored to use the corresponding PCRE functions instead.

The library has been developed against the test suite of the php 5.6 ereg extension in order to get as close to the original behavior as possible. While PCRE and POSIX regular expressions are very similar, they're not 100% compatible. There are certain edge cases that this library cannot cover.

All versions of ereg-shim with dependencies

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Package Version
Requires php Version >=5.3
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