grep: detect multi-line pattern with double capture

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1
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I have file, say test.s that contains several trivial infinite loops:

.LBB7_7:
 branch .LBB7_7

Labels may be totally different, but all are like .LBBd_d+

I want some neat way to process such things with grep or sed one-liner.

Now I am doing this way. First I calculate all labels:

grep -oP 'branch .KLBBd_d+' minimize.s

And then in bash for loop I looking up label with one line below with grep -A1 "^.$i:" and checking its output for branch $i

Can I do better (without explicit bash processing with grep only)?

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

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up vote
1
down vote

favorite

I have file, say test.s that contains several trivial infinite loops:

.LBB7_7:
 branch .LBB7_7

Labels may be totally different, but all are like .LBBd_d+

I want some neat way to process such things with grep or sed one-liner.

Now I am doing this way. First I calculate all labels:

grep -oP 'branch .KLBBd_d+' minimize.s

And then in bash for loop I looking up label with one line below with grep -A1 "^.$i:" and checking its output for branch $i

Can I do better (without explicit bash processing with grep only)?

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

add a commentÂ |Â

up vote
1
down vote

favorite

I have file, say test.s that contains several trivial infinite loops:

.LBB7_7:
 branch .LBB7_7

Labels may be totally different, but all are like .LBBd_d+

I want some neat way to process such things with grep or sed one-liner.

Now I am doing this way. First I calculate all labels:

grep -oP 'branch .KLBBd_d+' minimize.s

And then in bash for loop I looking up label with one line below with grep -A1 "^.$i:" and checking its output for branch $i

Can I do better (without explicit bash processing with grep only)?

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

I have file, say test.s that contains several trivial infinite loops:

.LBB7_7:
 branch .LBB7_7

Labels may be totally different, but all are like .LBBd_d+

I want some neat way to process such things with grep or sed one-liner.

Now I am doing this way. First I calculate all labels:

grep -oP 'branch .KLBBd_d+' minimize.s

And then in bash for loop I looking up label with one line below with grep -A1 "^.$i:" and checking its output for branch $i

Can I do better (without explicit bash processing with grep only)?

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

asked Dec 14 '17 at 9:11

Konstantin Vladimirov

1084

add a commentÂ |Â

1 Answer
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3
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try this:

$ cat ip.txt
foo
baz
.LBB7_7:
 branch .LBB7_7
xyzyadsf
.LBB8_3:
 mov a, b
 branch .LBB8_3
nop

$ grep -zoP '(.LBBd_d+):s*branchh+1n' ip.txt
.LBB7_7:
 branch .LBB7_7

-z will use ASCII NUL as record separator instead of default newline character. Assuming your input doesn't have NUL characters, this will cause whole file to be slurped

(.LBBd_d+) capture label, but can't specify to match at start of line

:s*branchh+1n condition to check for infinite loop

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

try this:

$ cat ip.txt
foo
baz
.LBB7_7:
 branch .LBB7_7
xyzyadsf
.LBB8_3:
 mov a, b
 branch .LBB8_3
nop

$ grep -zoP '(.LBBd_d+):s*branchh+1n' ip.txt
.LBB7_7:
 branch .LBB7_7

-z will use ASCII NUL as record separator instead of default newline character. Assuming your input doesn't have NUL characters, this will cause whole file to be slurped

(.LBBd_d+) capture label, but can't specify to match at start of line

:s*branchh+1n condition to check for infinite loop

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

add a commentÂ |Â

up vote
3
down vote

accepted

try this:

$ cat ip.txt
foo
baz
.LBB7_7:
 branch .LBB7_7
xyzyadsf
.LBB8_3:
 mov a, b
 branch .LBB8_3
nop

$ grep -zoP '(.LBBd_d+):s*branchh+1n' ip.txt
.LBB7_7:
 branch .LBB7_7

-z will use ASCII NUL as record separator instead of default newline character. Assuming your input doesn't have NUL characters, this will cause whole file to be slurped

(.LBBd_d+) capture label, but can't specify to match at start of line

:s*branchh+1n condition to check for infinite loop

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

add a commentÂ |Â

up vote
3
down vote

accepted

try this:

$ cat ip.txt
foo
baz
.LBB7_7:
 branch .LBB7_7
xyzyadsf
.LBB8_3:
 mov a, b
 branch .LBB8_3
nop

$ grep -zoP '(.LBBd_d+):s*branchh+1n' ip.txt
.LBB7_7:
 branch .LBB7_7

-z will use ASCII NUL as record separator instead of default newline character. Assuming your input doesn't have NUL characters, this will cause whole file to be slurped

(.LBBd_d+) capture label, but can't specify to match at start of line

:s*branchh+1n condition to check for infinite loop

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

try this:

$ cat ip.txt
foo
baz
.LBB7_7:
 branch .LBB7_7
xyzyadsf
.LBB8_3:
 mov a, b
 branch .LBB8_3
nop

$ grep -zoP '(.LBBd_d+):s*branchh+1n' ip.txt
.LBB7_7:
 branch .LBB7_7

-z will use ASCII NUL as record separator instead of default newline character. Assuming your input doesn't have NUL characters, this will cause whole file to be slurped

(.LBBd_d+) capture label, but can't specify to match at start of line

:s*branchh+1n condition to check for infinite loop

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

answered Dec 14 '17 at 9:24

Sundeep

6,9511826

add a commentÂ |Â

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