Template:Str find/doc

Usage
= Position of first appearance of sub_string in text.


 * Only searches first 50 characters of text. Returns -1 if sub_string not found in first 50 characters.
 * Character position is 1 based (not 0 based as usual in calculations).
 * Warning: if sub_string is empty, then this routine will return 1 !!! This case will often have to be handled specially.