Server side form validations in PHP and regular expression | PHP Lecture 12 | How to do this
Server side validation in php, Regular Expression in PHP, How to validate form data in PHP, Registration Form
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Server-side validation is another way to validate an HTML Form. In Server Side validation we can validate empty filed, input length, numeric value, valid email id and many more.
This script validate empty input field, input length, validate email and validate numeric value.
PHP can validate form input server side, submitted by the user using HTML forms.
You need to check a few things:
Numbers only
Empty values
Input length
Strip HTML tags
Email address
PHP | Regular Expressions:
Regular expressions commonly known as a regex (regexes) are a sequence of characters describing a special search pattern in the form of text string. They are basically used in programming world algorithms for matching some loosely defined patterns to achieve some relevant tasks. Some times regexes are understood as a mini programming language with a pattern notation which allows the users to parse text strings. The exact sequence of characters are unpredictable beforehand, so the regex helps in fetching the required strings based on a pattern definition.
Regular Expression is a compact way of describing a string pattern that matches a particular amount of text. As you know, PHP is an open-source language commonly used for website creation, it provides regular expression functions as an important tool. Like PHP, many other programming languages have their own implementation of regular expressions. This is the same with other applications also, which have their own support of regexes having various syntaxes. Many available modern languages and tools apply regexes on very large files and strings. Let us look into some of the advantages and uses of regular expressions in our applications.
Advantages and uses of Regular expressions:
In many scenarios, developers face problems whenever data are collected in free text fields as most of the programming deals with data entries. Regular expressions are used almost everywhere in today’s application programming.
Regular expressions help in validation of text strings which are of programmer’s interest.
It offers a powerful tool for analyzing, searching a pattern and modifying the text data.
It helps in searching specific string pattern and extracting matching results in a flexible manner.
It helps in parsing text files looking for a defined sequence of characters for further analysis or data manipulation.
With the help of in-built regexes functions, easy and simple solutions are provided for identifying patterns.
It effectively saves a lot of development time, which are in search of specific string pattern.
It helps in important user information validations like email address, phone numbers and IP address.
It helps in highlighting special keywords in a file based on search result or input.
It helps in identifying specific template tags and replacing those data with the actual data as per the requirement.
Regexes are very useful for creation of HTML template system recognizing tags.
Regexes are mostly used for browser detection, spam filteration, checking password strength and form validations.
