Creating subset using selected columns

Hello R experts,
  I need a help to create a subset file. I know with subset comand, its very
easy to select many different columns, or threshold. But here I have a bit
problem as in my data file is big. And I don't want to identify the column
numbers

or names manually. I am trying to find any way to automatise this.

For example I have a file with about 1500 columns from TRFLP intensity
data.


And the column names are like:
  [1] "Sample.Name"    "Marker"         "RE"             "Dye"
  "Allele.1"       "Size.1"         "Height.1"       "Peak.Area.1"
  "Data.Point.1"
   [10] "Allele.2"       "Size.2"         "Height.2"       "Peak.Area.2"
  "Data.Point.2"   "Allele.3"       "Size.3"         "Height.3"
"Peak.Area.3"
   [19] "Data.Point.3"   "Allele.4"       "Size.4"         "Height.4"
"Peak.Area.4"    "Data.Point.4"   "Allele.5"       "Size.5"
"Height.5"
   [28] "Peak.Area.5"    "Data.Point.5"   "Allele.6"       "Size.6"
"Height.6"       "Peak.Area.6"    "Data.Point.6"   "Allele.7"
"Size.7"
   [37] "Height.7"       "Peak.Area.7"    "Data.Point.7"   "Allele.8"
"Size.8"         "Height.8"       "Peak.Area.8"    "Data.Point.8"
"Allele.9"
   [46] "Size.9"         "Height.9"       "Peak.Area.9"    "Data.Point.9"
"Allele.10"      "Size.10"        "Height.10"      "Peak.Area.10"
"Data.Point.10"
.....

Suppose I want to create a subset selecting all the columns with
name Peak.Area
(as in unix Peak.Area.*)
How can I do that in R?
Thanks a lot for the help.
Best wishes,
Mitra

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