form> Username (letters and numbers only, no punctuation or special characters) What do the square brackets and plus sign (+) mean?
form> Username (letters and numbers only, no punctuation or special characters) What do the square brackets and plus sign (+) mean?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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form>
<label for="username">Username <i>(letters and numbers only, no punctuation or special characters)</i></label><br> <input name="username" id="username" pattern="[A-Za-z0-9]+">
</form>
What do the square brackets and plus sign (+) mean?
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