Lines starting with special characters

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# 1  
Old 11-08-2013
Lines starting with special characters


I have a file and need to extract lines starting with "[" but it gives me error when i try

grep ^"["  file
grep: Invalid regular expression

I tried with quotes single/double before/after but no luck.

suggestion pls, thanks!
# 2  
Old 11-08-2013
grep '^\[' file

# 3  
Old 11-08-2013
Refer: Character Classes and Bracket Expressions to understand why it failed.
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