In the text variable "textvar", all occurrences of the  from= string are replaced with the to= string.  You can then use  if Q[ok] in order to query whether at least one string replacement has been carried out.

Instead of from= you can also use fromHexCode= ; analogously toHexCode= instead of  to= . Using this notation you can specify  hexadecimal strings. Examples:

// set newline code
ReplaceText "t1" from="<newline>" toHexCode="0d0a"

// delete utf8-header
ReplaceText "t1" fromHexCode="efbbbf" to=""