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How to use regexp to search for separated sequences?

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Ank Agarwal
Ank Agarwal 2016-12-12
关闭： MATLAB Answer Bot 2021-8-20
Say I have a text file with tons of random letters and I want to search it for the sequence ABBA[AGTC]DABA I want ABBA and DABA to be on the ends of the sequence but also want a variable sequence in the middle. GAGA can be either 0, 4, or 6 letters and can be any combination of the letters AGTC.
Any idea how to search for such sequences using regexp? Maybe another search command?
  2 个评论
Star Strider
Star Strider 2016-12-12
Is the ‘variable sequence in the middle’ always enclosed within square brackets []?
Can you provide a sample sequence, or a file with some sample sequences, in the format you expect to use them?
per isakson
per isakson 2016-12-12
编辑：per isakson 2016-12-12
Are you looking for something like this
>> regexp( 'ABBAAGTGTCDABA', 'ABBA([AGTC]{0}|[AGTC]{4}|[AGTC]{6})DABA', 'match' )
ans =
'ABBAAGTGTCDABA'
>> regexp( 'ABBADABA', 'ABBA([AGTC]{0}|[AGTC]{4}|[AGTC]{6})DABA', 'match' )
ans =
'ABBADABA'
>> regexp( 'xxxABBAAGTGTCDABAzzz', 'ABBA([AGTC]{0}|[AGTC]{4}|[AGTC]{6})DABA', 'match' )
ans =
'ABBAAGTGTCDABA'

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