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== find ==

This function allows one to search for a target string or pattern within another string.

Usage:

: <code><nowiki>{{#invoke:</nowiki>String|find|''source_str''|''target_string''|''start_index''|''plain_flag''}}</code>

OR

: <code><nowiki>{{#invoke:</nowiki>String|find|source= ''source_str'' |target= ''target_str'' |start= ''start_index''|plain= ''plain_flag'' }}</code>

Parameters:

; source
: The string to search
; target
: The string or pattern to find within source
; start
: The index within the source string to start the search, defaults to 1
; plain
: Boolean flag indicating that target should be understood as plain text and not as a [[w:en:Lua (programming language)|Lua]]-style [[w:en:regular expression|regular expression]], defaults to true

This function returns the first index >= "start" where "target" can be found within "source".  Indices are 1-based.  If "target" is not found, then this function returns 0.  If either "source" or "target" are missing / empty, this function also returns 0.

This function should be safe for UTF-8 strings.