Haskell: use Data.Text.replace to replace only the first occurrence of a text value -

Haskell: use Data.Text.replace to replace only the first occurrence of a text value -

how replace first occurrence of "substring" (actually data.text.text) in text value in haskell in efficient way?

you can breakon substring,

breakon :: text -> text -> (text, text)

to split text 2 parts @ first occurrence of pattern, replace substring @ start of sec component:

replaceone :: text -> text -> text -> text replaceone pattern substitution text | t.null = text -- pattern doesn't occur | otherwise = t.concat [front, substitution, t.drop (t.length pattern) back] (front, back) = breakon pattern text

haskell