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How can awk search a string without using regular expression?

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# 1  
Old 09-04-2011
How can awk search a string without using regular expression?
Hello,
Awk seem treat the pattern as regular expression, how can awk search not using regular expression? e.g. [Aa] just represent for "[Aa]", not "A" or "a" . I don't want to add backslash [ and ] .
# 2  
Old 09-04-2011
You need to treat the pattern as a literal string.
# 3  
Old 09-04-2011
Code:
printf "he[ll]o\nhi\n" | awk 'index($0, "[ll]")'
he[ll]o

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