This template uses Lua :
The Template:str_find0 returns first appearance of a substring in a string, otherwise returns -1.template:str sub find which does the routine.
{{str find0 |<string1>|<string2>}}
It is zero-based. So no need for extra {{#expr:{{str find|}}-1}} calculations to use it in other templates. Handles strings up to 90 characters. Very fast on short strings. Uses enhanced algorithm to run the subroutine only when needed. {{str find0|abcdef|abc}} → 0
{{str find0|abcdef|def}} → 3
{{str find0|abcdef|ghi}} → -1
{{str find0|abcdef|abcdefghi}} → -1
String-handling templates
(help page)
Substring (select chunk of string by its position)
{{ str sub new }} Select a substring based on starting and ending index counted in either direction. {{ str left }} Keep the first N characters of a string, or duplicate it to N characters. {{ str crop }} Return all but the last N characters of a string. {{ str index }} Return the N-th character of a string.
{{ str right }} Return substring starting at N-th character to end of string. {{ str rightc }} Return the last N characters of a string; or a given value if empty. {{ str sub old }} Return substring of given length starting at N-th character.
Trimming (select/remove chunk of string by character type)
Select/remove specific item from string
{{ ship prefix }} Returns the length of a ship's name prefix, if listed (ship names). {{ title year }} Returns the 3-or-4-digit year from a pagename, if any. {{ title decade }} Returns the 4-digit decade (e.g. "1740s") from a pagename, if any. {{ title number }} Returns any number from a pagename.
Insertion, replacement and length
{{ loop }} Repeat character string a specified number of times. {{ replace }} Returns the string, after replacing all occurrences of a specified string with another string. {{ str rep }} Returns the string, after replacing the first occurrence of a specified string with another string. {{ digits }} Returns the string, after removing all characters that are not digits 0–9 {{ Nowiki }} Displays wikitext as plain text.
{{ str len }} Returns a string's length. {{ str ≥ len }} Check if a string is "longer or equally long" or "shorter" than a given length. {{ str ≤ len }} Check if a string is "shorter or equally long" or "longer" than a given length. {{ str ≠ len }} Check if a string is "not equal" or "equal" to a given length.
Analysis and searching
{{ str startswith }} {{ str endswith }} Check if a string starts or ends with a given string. {{ str find }} , {{ strfind short }} Returns the numerical location of a given string in a string. {{ in string }} Returns optional string when given string is not found {{ str count }} Count the number of occurrences of a pattern within a string.
{{ a or an }} Takes a noun and produces the appropriate indefinite article, based on whether the first letter is a vowel. {{ Array }} Array manipulation and retrieval. {{ Isnumeric }} Returns number when true, blank when not numeric. {{ str letter }} Returns the number of letters that begin a string. {{ str number }} Returns the number of numbers that begin a string.
Modules and built-in functions
