How to find if String contains html data?

Question

How do I find if a string contains HTML data or not? The user provides input via web interface and it\'s quite possible he could have used either a simple text or used HTML

Answer 1

If you don't want the user to have HTML in their input, you can replace all '<' characters with their HTML entity equivalent, '& lt;' and all '>' with '& gt;' (no spaces between & and g)