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This template is used in MediaWiki:Titleblacklist-custom-archive  , and on approximately 1,760,000 pages, or roughly 3% of all pages . Changes to it can cause immediate changes to the Wikipedia user interface.  To avoid major disruption and server load, any changes should be tested in the template's /sandbox  or /testcases  subpages, or in your own user subpage . The tested changes can be added to this page in a single edit. Please discuss changes on the talk page  before implementing them.
This template  uses Lua :
 
 
Usage 
{{replace|string |target |replacement |count=n }}
Returns string  with the first n  occurrences of target  replaced with replacement . Omitting count will replace all occurrences. Space counts as a character if placed in any of the first three parameters.
Examples 
{{replace|One two two three two four twotwo five|two|NINE}} → One NINE NINE three NINE four NINENINE five 
{{replace|One two two three two four twotwo five|two|NINE|count=2}} → One NINE NINE three two four twotwo five 
{{replace|foo_bar|_| }} → foo bar 
Space 
{{replace|One-two two-three two-four twotwo-five|-|—}} → One—two two—three two—four twotwo—five 
{{replace|One-two two-three two-four twotwo-five|- |—}} → One-two two-three two-four twotwo-five 
See also 
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
  {{ 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). 
   {{ title year }}   Returns the 3-or-4-digit year from a pagename, if any.  {{ title decade }}   Returns the 4-digit decade from a pagename (e.g. "1740" from "Foo 1740s bar"), if any.  {{ title number }}   Returns any number from a pagename.  {{ WikiProjectbasename }}   Removes "WikiProject" 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
  
       
     {{ Array }}   Array item manipulation and retrieval.  {{ a or an }}   Takes a noun and produces the appropriate indefinite article, based on whether the first letter is a vowel.  {{ in string }}   Returns optional string when given string is not found  {{ 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