noun
replacement text
Computing term for text that replaces another string, often used in search-and-replace operations or template substitution.
検索と置換で、置換文を入力してください。
In find and replace, please enter the replacement text.
検索文 is the search text or pattern to be found, whereas 置換文 is the text that replaces it.
Compound of 置換 (replacement) and 文 (text, sentence). A straightforward technical term formed from Sino-Japanese elements.