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Remove comments like pattern from text

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# 1  
Old 02-29-2016
Question Remove comments like pattern from text
Hi , We need to remove comment like pattern from a code text. The possible comment expressions are as follows.

Input
Code:
BizComment : Special/*@
    Name:bzt_53_3aea640a_51783afa_5d64_0
    BizHidden:true
@*/

/*   lookup Disease 
Category Therapuetic Class   */

a=b;
out0::bzt_53_3aea640a_51783afa_5d64_0(in0)= 1; /* Final assignment */



Output

Code:
BizComment : Special

a=b;
out0::bzt_53_3aea640a_51783afa_5d64_0(in0)= 1;

Basically, requirement is to replace
Code:
/@* ... *@/

and
Code:
/* .... */

style comments.

Also can you please guide the concept of using regex in similar scenarios.
Last edited by vbe; 02-29-2016 at 10:11 AM.. Reason: code tags please... not ICODE
# 2  
Old 02-29-2016
How about
Code:
sed '/\/\*/{:L; s/\*\//&/; tK; N; bL; :K; s/\/\*.*\*\///} ' file
BizComment : Special



a=b;
out0::bzt_53_3aea640a_51783afa_5d64_0(in0)= 1;

# 3  
Old 02-29-2016
Note that if you have source code that prints comments or looks for comments:
Code:
/* printf format string to print comments */
char fmt[]='/*
  %s
*/\n'

you'll need a MUCH more complex parser to decide what is code and what is a comment.
# 4  
Old 02-29-2016
try also gnu awk:
Code:
awk '$1=$1' RS= FS="/[*].*[*]/" infile

# 5  
Old 03-01-2016
To handle this with regexp, I suggest that you use a language, where the regexp engine can do balanced matching - for example Ruby or Perl. See for reference this posting: regex - Matching balanced parenthesis in Ruby using recursive regular expressions like perl - Stack Overflow
# 6  
Old 03-01-2016
Thanks a lot everyone. Your suggestions helped to solve my problem.

I understood the code but not completely. Can you please help me to understand for both awk and sed.
# 7  
Old 03-01-2016
The sed, when finding an comment opener, if need be loops, reading and appending new lines, until it finds the comment closer, then removes the entire comment.
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