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Moodle JavaScript Cookbook by Alastair Hole

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Adding custom validation with a Regular Expression

Regular Expressions are a powerful method for matching the pattern of strings of text. This has particular relevance to text validation. In this recipe, we will add a simple regular expression to validate a URL which will require the text entered to begin with http://. This method does, however, allow any valid Regular Expression making it particularly flexible for validating any pattern that can be represented in a Regular Expression.

Getting ready

Please refer to the first recipe in this chapter for details on how to prepare a QuickForm web form which is the basis of this recipe.

How to do it...

Add the following code to our form definition in validation_form.php, just after the field definition: ...

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