Eliminate space in word file

in my word file there are hundrens of paragraph which like the format below. There is a single letter Y here. It can be other letter except "A","T","C","G". I want to remove the white space in it then create a new line.

AAATGGGCCC CACAGAAGTG AGAATGGGTG AAGTCAGAAT TCCTGGTAAT GAAGTGCTTG
AACTTGGATT CCTCCCGACA TGTGCAGTAC AATGAGATGA TTTTCTCCTT AATGAGATTA
GGAAATTCTA TTAGCGCTCC CAGCTGCTGA CCCGATTCCA TGAGGCTGAG GCTCCAGGGC
TGAACCTGCC TGGTT
Y
AGTGTTCCTG GAAACTAGAC ACCCCACCCT TCAGATGGGC CAGGGCCTCC CCAGCTCTAC
CTAAAGCTGT GGTCTGCCCC CAGGGGTGCC CAGTTTCCTC CCTTCACCCT GTGCTCCAGA
GGAGTGTGGG GCCCTGGGCA TTCTGCAGTG TACCCCAGGA TCCTCACTCC TTCCTGCTTA

The new line's format is

AAATGGGCCCCACAGAAGTGAGAATGGGTGAAGTCAGAATTCCTGGTAATGAAGTGCTTGAACTTGGATTCCTCCCGACATGTGCAGTACAATGAGATGATTTTCTCCTTAATG开发者_JAVA技巧AGATTAGGAAATTCTATTAGCGCTCCCAGCTGCTGACCCGATTCCATGAGGCTGAGGCTCCAGGGCTGAACCTGCCTGGTT[Y]AGTGTTCCTGGAAACTAGACACCCCACCCTTCAGATGGGCCAGGGCCTCCCCAGCTCTACCTAAAGCTGTGGTCTGCCCCCAGGGGTGCCCAGTTTCCTCCCTTCACCCTGTGCTCCAGAGGAGTGTGGGGCCCTGGGCATTCTGCAGTGTACCCCAGGATCCTCACTCCTTCCTGCTTA

Notice Y becomes [Y].

The final result will be saved as a text file. Thanks for help.

You don't need to write a program. The “Replace” tool is sufficient for this:

1. Replace Y with [Y] (EDIT: see the comments below, because it's a little more complex than that indeed)
2. Replace ^w with nothing (^w means whitespace)
3. Replace ^p with nothing (^p means paragraph markers)

EDIT: if you need a macro, just do the above once while recording a macro.

EDIT: by applying the method discussed in the comments, I get the following VBA macro:

Sub ProcessATCG()
    Selection.Find.ClearFormatting
    Selection.Find.Replacement.ClearFormatting
    With Selection.Find
        .Text = "([!ACGT^13^32])"
        .Replacement.Text = "[\1]"
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchWildcards = True
    End With
    Selection.Find.Execute Replace:=wdReplaceAll
    With Selection.Find
        .Text = "[^13^32]"
        .Replacement.Text = ""
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchWildcards = True
    End With
    Selection.Find.Execute Replace:=wdReplaceAll
End Sub