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Regular Expression - Introduction

Hi friends,

I hope, We are all know how to create at least a log in page in any one or more programming language or using tool.

But the idea here is, as the input get from the user is may be valid or not , that makes some sense, suppose a user creating a username
with !@#$%^& , There is no sense in it,

So for this type of situation a regular expression will come into play, the regular expression is used in most of the languages, text editors and packages.

suppose we want to get a username from the user with only text, we can use that specific PATTERN as regular expression, so we can move forward slowly what is regular expression, what is text mining, application of regular expression,regular expression in programming lanquage one by one, meanwhile you can also go through about regular expression, it will be very useful, we will see the sample and example in the future...

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