Try this
Code:
Sub Macro3()
With ActiveDocument.Range.Find
.ClearFormatting
.Replacement.ClearFormatting
.Text = "^13[0-9]{1,4}^013*[0-9]{2},[0-9]{3}^013"
.Replacement.Text = "^p"
.Forward = True
.Wrap = wdFindContinue
.Format = False
.MatchCase = False
.MatchWholeWord = False
.MatchAllWordForms = False
.MatchSoundsLike = False
.MatchWildcards = True
.Execute Replace:=wdReplaceAll
End With