剥离空白

{-# LANGUAGE OverloadedStrings #-}

import qualified Data.Text as T

myText::T.Text
myText = "\n\r\t   leading and trailing whitespace   \t\r\n"

strip 从 Text 值的开头和结尾删除空格。

ghci> T.strip myText
"leading and trailing whitespace"

stripStart 仅从一开始就删除空格。

ghci> T.stripStart myText
"leading and trailing whitespace   \t\r\n"

stripEnd 只从末尾删除空格。

ghci> T.stripEnd myText
"\n\r\t   leading and trailing whitespace"

filter 可用于从中间删除空格或其他字符。

ghci> T.filter /=' ' "spaces in the middle of a text string"
"spacesinthemiddleofatextstring"