How to use the pattern attribute to validate input fields against a specific regular expression?
How to use the pattern attribute to validate input fields against a specific regular expression?
21711-May-2023
Updated on 11-May-2023
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How to use the pattern attribute to validate input fields against a specific regular expression?
Aryan Kumar
11-May-2023The pattern attribute is used to validate input fields against a specific regular expression. A regular expression is a sequence of characters that defines a search pattern. For example, the regular expression ^[a-zA-Z0-9]+<span class="math-inline">\ matches any string that consists of only letters and numbers. To use the pattern attribute, you simply need to set the attribute's value to the regular expression that you want to use. For example, the following code would use the regular expression `^[a-zA-Z0-9]+to validate the input fieldusername`:
Code snippet
If the value of the input field does not match the regular expression, then the input field will be considered invalid.
Here are some examples of how to use the pattern attribute to validate input fields against specific regular expressions:
The pattern attribute is a powerful tool that can be used to validate input fields against a variety of different regular expressions.