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There are two ways to use regular expressions in php. One is the true PHP style in which case we have to use ereg() function and the other is to use Perl style syntax for our validations. In this case we have to use preg_match() function. In this tutorial we will use preg_match() because it is faster in most cases and also supports the most common regular expression syntax. It also gives us more capabilities, that we can use.
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