How to remove only html tags in a string?

Question

I have written code for removing HTML tags, but it is also removing a type of strings. I want it to not to remove strings like 2<3 or

Answer 1

Sorry I had not validate enough.

I have checked php5-cli expression below.

(?:<|<)\/?([a-zA-Z]+) *[^<\/]*?(?:>|>)

PHP code goes:

#!/usr/bin/php 

a1 
1>2

hello world<> google com
abcde";

echo "text--->".preg_replace('/(?:<|<)\/?([a-zA-Z]+) *[^<\/]*?(?:>|>)/', '', $str)."\n";

?>

Result:

text--->
a1 
1>2
hello world
hello world<> google com
abcde