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Description of problem:
grep called with option --color=auto works fine with
pattern matching given expr like "one|two|three", but
gives wrong results if gives the expr from file with
option -f patternfile. 
patternfile:
one
three
two

Different behavior with egrep=grep -E and grep -F...




Version-Release number of selected component (if applicable):
grep-2.5.1-17.4

How reproducible:
Always

Steps to Reproduce:
1. echo -e "one two test runs here\nok runs one test one" | egrep
--color=auto  "runs|one|test"
2. echo -e "one two test runs here\nok runs one test one" | egrep
--color=auto -f pattern
pattern: 
runs
one
test
3.
    

Actual Results:  1. one two test runs here (only two,here not highlighted)
   ok runs one test one (only ok not hl)
2. one .. (only runs hl)
   ok .. (only ok, test not hl)

Expected Results:  1. OK
2. like 1.

Additional info:

Try changing the order of the pattern in pattenfile, gives
different output.