I'd like to define a couple of different <HR> lines (for example, one <HR> with shades and specific color, another <HR> with different color and size, etc.) in external CSS, but I can't find a solution. I know how to define a 'global' <HR> (for a whole page/site), but I need several different predefined lines.
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Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: