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Top Forums Shell Programming and Scripting awk's gsub variable in replacement Post 302512548 by mirni on Sunday 10th of April 2011 10:00:07 PM
Old 04-10-2011
awk's gsub variable in replacement

I been trying to figure out how to use element of array as a replacement pattern. This works as I expected:
Code:
$ echo "one two three" | awk '{
  gsub(/wo/,"_BEG_&_END_",$2); 
  print }'
one t_BEG_wo_END_ three 
$ echo "one two three" | awk '{
  tmp="foo"; 
  gsub(/wo/,"_BEG_" tmp "_END_",$2); 
  print}'
one t_BEG_foo_END_ three
$ echo "one two three" | awk '{
  tmp["wo"]="foo"; 
  gsub(/wo/,"_BEG_" tmp["wo"] "_END_",$2); 
  print}'
one t_BEG_foo_END_ three
$ echo "one two three" | awk '{
  tmp["wo"]="foo"; 
  a="wo"; 
  gsub(/wo/,"_BEG_" tmp[a] "_END_",$2); 
  print}'
one t_BEG_foo_END_ three

So why does this not?
Code:
$ echo "one two three" | awk '{tmp["wo"]="foo"; gsub(/wo/,"_BEG_" tmp["&"] "_END_",$2); print}'
one t_BEG__END_ three

How do I access the element of array tmp[<captured_string>]?
Thank you.

Last edited by mirni; 04-11-2011 at 12:41 AM..
 

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EREGI_REPLACE(3)							 1							  EREGI_REPLACE(3)

eregi_replace - Replace regular expression case insensitive

SYNOPSIS
string eregi_replace (string $pattern, string $replacement, string $string) DESCRIPTION
This function is identical to ereg_replace(3) except that this ignores case distinction when matching alphabetic characters. Warning This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged. PARAMETERS
o $pattern - A POSIX extended regular expression. o $replacement - If $pattern contains parenthesized substrings, $replacement may contain substrings of the form digit, which will be replaced by the text matching the digit'th parenthesized substring; will produce the entire contents of string. Up to nine substrings may be used. Parentheses may be nested, in which case they are counted by the opening parenthesis. o $string - The input string. RETURN VALUES
The modified string is returned. If no matches are found in $string, then it will be returned unchanged. EXAMPLES
Example #1 Highlight search results <?php $pattern = '(>[^<]*)('. quotemeta($_GET['search']) .')'; $replacement = '\1<span class="search">\2</span>'; $body = eregi_replace($pattern, $replacement, $body); ?> NOTES
Note As of PHP 5.3.0, the regex extension is deprecated in favor of the PCRE extension. Calling this function will issue an E_DEPRECATED notice. See the list of differences for help on converting to PCRE. Tip eregi_replace(3) is deprecated as of PHP 5.3.0. preg_replace(3) with the i ( PCRE_CASELESS) modifier is the suggested alternative. SEE ALSO
ereg(3), eregi(3), ereg_replace(3), preg_replace(3), quotemeta(3). PHP Documentation Group EREGI_REPLACE(3)
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