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How do extract the string before the colon?

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-1

How do extract the string before the colon. I don't want the string after the colon.

Sample input:

asfmqwdbd/ilcp:dftqclk_rep

Desired result:

asfmqwdbd/ilcp

My code:

if (m/^(S+))
 $inst_name = $1;

regex perl

share|improve this question

edited Mar 12 at 7:47

Thibhika Ravichandran

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  m/^([^s:]+)/ - if you meant before the first colon
  
  – Wiktor Stribiżew
  Mar 7 at 6:05
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can ypu please edit your question? Your example does not contain a semicolon ;. Did you mean colon :?
  
  – Stefan Becker
  Mar 7 at 6:06
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Shouldn't the desired result be asfmqwdbd/ilcp?
  
  – ikegami
  Mar 7 at 7:04
  

  
  
  
  

add a comment | 

-1

How do extract the string before the colon. I don't want the string after the colon.

Sample input:

asfmqwdbd/ilcp:dftqclk_rep

Desired result:

asfmqwdbd/ilcp

My code:

if (m/^(S+))
 $inst_name = $1;

regex perl

share|improve this question

edited Mar 12 at 7:47

Thibhika Ravichandran

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  m/^([^s:]+)/ - if you meant before the first colon
  
  – Wiktor Stribiżew
  Mar 7 at 6:05
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can ypu please edit your question? Your example does not contain a semicolon ;. Did you mean colon :?
  
  – Stefan Becker
  Mar 7 at 6:06
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Shouldn't the desired result be asfmqwdbd/ilcp?
  
  – ikegami
  Mar 7 at 7:04
  

  
  
  
  

add a comment | 

How do extract the string before the colon. I don't want the string after the colon.

Sample input:

asfmqwdbd/ilcp:dftqclk_rep

Desired result:

asfmqwdbd/ilcp

My code:

if (m/^(S+))
 $inst_name = $1;

regex perl

share|improve this question

edited Mar 12 at 7:47

Thibhika Ravichandran

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

asfmqwdbd/ilcp:dftqclk_rep

asfmqwdbd/ilcp

if (m/^(S+))
 $inst_name = $1;

share|improve this question

edited Mar 12 at 7:47

Thibhika Ravichandran

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

share|improve this question

edited Mar 12 at 7:47

Thibhika Ravichandran

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

asked Mar 7 at 5:07

Thibhika RavichandranThibhika Ravichandran

11

3 Answers
3

active

oldest

votes

1

Assuming that semicolon (;) was a typo in the question and you actually meant colon (:) this would be the correct regex:

• anchor at beginning of line (^)


• capture one-or-more non-colon characters (([^:]+))


• match must end on a colon (:)

#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) 
 print "$1n" if /^([^:]+):/;


exit 0;

__DATA__
asfmqwdbd/ilcp
asfmqwdbd/ilcp:dftqclk_repasfmq
asfmqwdbd/ilcp;dftqclk_repasfmq

Test run:

$ perl dummy.pl
asfmqwdbd/ilcp

share|improve this answer

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

add a comment | 

0

Assuming from your question you want the output like this
"asfmqwdbd/ilcp"
for this you can use "^([S]+):" and then use $1.

share|improve this answer

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

add a comment | 

0

I think you are looking for

$ echo "asfmqwdbd/ilcp:dftqclk_repasfmq" | perl -pe 's/(S+):.*/$1/ '
asfmqwdbd/ilcp

or

$ perl -le ' $x="asfmqwdbd/ilcp:dftqclk_repasfmq"; $x=~s/(S+):.*/$1/; print $x '
asfmqwdbd/ilcp

$

share|improve this answer

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

add a comment | 

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1

Assuming that semicolon (;) was a typo in the question and you actually meant colon (:) this would be the correct regex:

• anchor at beginning of line (^)


• capture one-or-more non-colon characters (([^:]+))


• match must end on a colon (:)

#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) 
 print "$1n" if /^([^:]+):/;


exit 0;

__DATA__
asfmqwdbd/ilcp
asfmqwdbd/ilcp:dftqclk_repasfmq
asfmqwdbd/ilcp;dftqclk_repasfmq

Test run:

$ perl dummy.pl
asfmqwdbd/ilcp

share|improve this answer

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

add a comment | 

1

Assuming that semicolon (;) was a typo in the question and you actually meant colon (:) this would be the correct regex:

• anchor at beginning of line (^)


• capture one-or-more non-colon characters (([^:]+))


• match must end on a colon (:)

#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) 
 print "$1n" if /^([^:]+):/;


exit 0;

__DATA__
asfmqwdbd/ilcp
asfmqwdbd/ilcp:dftqclk_repasfmq
asfmqwdbd/ilcp;dftqclk_repasfmq

Test run:

$ perl dummy.pl
asfmqwdbd/ilcp

share|improve this answer

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

add a comment | 

Assuming that semicolon (;) was a typo in the question and you actually meant colon (:) this would be the correct regex:

• anchor at beginning of line (^)


• capture one-or-more non-colon characters (([^:]+))


• match must end on a colon (:)

#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) 
 print "$1n" if /^([^:]+):/;


exit 0;

__DATA__
asfmqwdbd/ilcp
asfmqwdbd/ilcp:dftqclk_repasfmq
asfmqwdbd/ilcp;dftqclk_repasfmq

Test run:

$ perl dummy.pl
asfmqwdbd/ilcp

share|improve this answer

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) 
 print "$1n" if /^([^:]+):/;


exit 0;

__DATA__
asfmqwdbd/ilcp
asfmqwdbd/ilcp:dftqclk_repasfmq
asfmqwdbd/ilcp;dftqclk_repasfmq

$ perl dummy.pl
asfmqwdbd/ilcp

share|improve this answer

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

answered Mar 7 at 6:11

Stefan BeckerStefan Becker

4,11521125

0

Assuming from your question you want the output like this
"asfmqwdbd/ilcp"
for this you can use "^([S]+):" and then use $1.

share|improve this answer

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

add a comment | 

0

Assuming from your question you want the output like this
"asfmqwdbd/ilcp"
for this you can use "^([S]+):" and then use $1.

share|improve this answer

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

add a comment | 

Assuming from your question you want the output like this
"asfmqwdbd/ilcp"
for this you can use "^([S]+):" and then use $1.

share|improve this answer

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

share|improve this answer

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

answered Mar 7 at 10:28

Huban AhmedHuban Ahmed

41

0

I think you are looking for

$ echo "asfmqwdbd/ilcp:dftqclk_repasfmq" | perl -pe 's/(S+):.*/$1/ '
asfmqwdbd/ilcp

or

$ perl -le ' $x="asfmqwdbd/ilcp:dftqclk_repasfmq"; $x=~s/(S+):.*/$1/; print $x '
asfmqwdbd/ilcp

$

share|improve this answer

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

add a comment | 

0

I think you are looking for

$ echo "asfmqwdbd/ilcp:dftqclk_repasfmq" | perl -pe 's/(S+):.*/$1/ '
asfmqwdbd/ilcp

or

$ perl -le ' $x="asfmqwdbd/ilcp:dftqclk_repasfmq"; $x=~s/(S+):.*/$1/; print $x '
asfmqwdbd/ilcp

$

share|improve this answer

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

add a comment | 

I think you are looking for

$ echo "asfmqwdbd/ilcp:dftqclk_repasfmq" | perl -pe 's/(S+):.*/$1/ '
asfmqwdbd/ilcp

or

$ perl -le ' $x="asfmqwdbd/ilcp:dftqclk_repasfmq"; $x=~s/(S+):.*/$1/; print $x '
asfmqwdbd/ilcp

$

share|improve this answer

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

$ echo "asfmqwdbd/ilcp:dftqclk_repasfmq" | perl -pe 's/(S+):.*/$1/ '
asfmqwdbd/ilcp

$ perl -le ' $x="asfmqwdbd/ilcp:dftqclk_repasfmq"; $x=~s/(S+):.*/$1/; print $x '
asfmqwdbd/ilcp

$

share|improve this answer

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423

answered Mar 7 at 17:14

stack0114106stack0114106

4,7602423