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Grepping or awking multiple lines in a file - regex

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# 1  
Old 08-11-2016
Grepping or awking multiple lines in a file - regex
data.txt:

Code:
hellohellohello
mellomello1mello
tellotellotellotello
bellobellowbellow
vellow

My attempts:

Code:
egrep ".*mello1\n.*bellow" data.txt
awk '/.*mello1.*\nbellow/' data.txt


how can i search for patterns that are on different lines using simple egrep or awk?

i only want the egrep or awk command to output data IF and only IF the output of data.txt contains mello1 and bellow (on different lines).
# 2  
Old 08-11-2016
Code:
sed -n '/mello1/,/bellow/p' data.txt

This User Gave Thanks to rdrtx1 For This Post:
SkySmart
# 3  
Old 08-11-2016
Quote:
Originally Posted by rdrtx1
Code:
sed -n '/mello1/,/bellow/p' data.txt


under normal circumstances, i'd be content with this.
however, the script being used here i have no control over modifying it.

i need to pass a regex that can be fed as an argument to the script.

which is why i was using the egrep and awk. i need to be able to pass a variation of this to the script:

Code:
".*mello1.*\n.*bellow.*"

Last edited by SkySmart; 08-11-2016 at 02:35 PM..
# 4  
Old 08-11-2016
Hello SkySmart,

I am not completely sure about your requirement but could you please try following and let us know how it goes then.
Code:
awk -vs1="mello.*ello"  '{match($0,s1);if(substr($0,RSTART,RLENGTH)){print}}  Input_file

Output will as follows.
Code:
mellomello1mello

In case you want to assign a shell variable's value to awk's variable then following may help you in same.
Code:
S="mello.*ello"    ##Shell variable
awk -vs1=$S '{match($0,s1);if(substr($0,RSTART,RLENGTH)){print}}'  Input_file

Output will be as follows.
Code:
mellomello1mello

Just wanted to add here above was tested in GNU awk.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
SkySmart
# 5  
Old 08-11-2016
Quote:
Originally Posted by RavinderSingh13
Hello SkySmart,

I am not completely sure about your requirement but could you please try following and let us know how it goes then.
Code:
awk -vs1="mello.*ello"  '{match($0,s1);if(substr($0,RSTART,RLENGTH)){print}}  Input_file

Output will as follows.
Code:
mellomello1mello

In case you want to assign a shell variable's value to awk's variable then following may help you in same.
Code:
S="mello.*ello"    ##Shell variable
awk -vs1=$S '{match($0,s1);if(substr($0,RSTART,RLENGTH)){print}}'  Input_file

Output will be as follows.
Code:
mellomello1mello

Just wanted to add here above was tested in GNU awk.

Thanks,
R. Singh

the expected output should be something like:

Code:
egrep ".*mello1\n.*bellow" data.txt

mellomello1mello
tellotellotellotello
bellobellowbellow

# 6  
Old 08-11-2016
You might want to make a file for your sed commands:
Code:
/mello1/{
N
.........
}

After you find mello1 the N will append the next line to the "pattern space" so you could check for "mello1.*bellow" in place of the dotted line.
This User Gave Thanks to wbport For This Post:
SkySmart
# 7  
Old 08-11-2016
If your input file contains just:
Code:
hellohellohello
mellomello1mello
tellotellotellotello

should there be any output?

If your input file contains:
Code:
hellohellohello
mellomello1mello
tellotellotellotello
bellobellowbellow
fellow
hellohellohello
mellomello1mello
tellotellotellotello
bellobellowbellow
vellow

what should the output be? (From the 1st mello1 to the last bellow? Or two distinct sets from mello1 to bellow?)

If the input file contains:
Code:
hellohellohello
mellomello1mello
tellotellotellotello
fellow
hellohellohello
mellomello1mello
tellotellotellotello
bellobellowbellow
vellow

what should the output be? (From the 1st mello1 to the bellow? Or from the last mello1 to the bellow?)
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