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This template uses Lua:

This is the ((Str startswith)) meta-template.

It returns "yes" if the second parameter is the start of the first parameter. Both parameters are trimmed before use.

Border cases:

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)

((trim))	Trim any leading or trailing whitespace
((str letter/trim))	Trim down to the beginning letters.
((str number/trim))	Trim down to the beginning numbers.
((trim brackets))	Trim any leading or trailing square brackets.
((trim quotes))	Trim leading or trailing matching quotes.
((trim leading))	Trim up to six instances of specified <prefix>.

((string split))	Extract a short string from a long string.
((first word))	Trim down to the first space.
((remove first word))	Remove anything before the first space.
((last word))	Trim down from the last space.
((remove last word))	Remove anything after the last space.

Select/remove specific item from string

((delink)), ((trim brackets))	Removes wikilink brackets (wikicode); all or outer only.
((Plain text))	Removes wikicode (formatting and brackets)
((PAGENAMEBASE))	Trim off any parenthesis text at the end of a string (disambiguation).
((title disambig text))	Returns text in parentheses at the end of a string (disambiguation).
((WikiProjectbasename))	Removes "WikiProject" from a pagename.

((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
Module:String, Module:String2, Module:Ustring, Module:Text, wikitext handling: modules that together contain most necessary string functions. Magic words: About `((padleft:\|))`, `((lc:\|))`, `((formatnum:\|))` etc. ParserFunctions: About `((#titleparts:\|)), ((#expr:\|)), ((#ifeq:\|)),` etc.

The above documentation is transcluded from Template:Str startswith/doc.
Editors can experiment in this template's sandbox and testcases pages.
Add categories to the /doc subpage. Subpages of this template.