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Top Forums Shell Programming and Scripting Conditional search and delete using SED / Shell script Post 302583210 by balajesuri on Tuesday 20th of December 2011 01:16:20 AM
Old 12-20-2011
@Ygor: I too tried that initially. But it wouldn't work if there was an 'a' at the end, as in "abcdaabcadgfaarstaba". Surprising, but it isn't considering "a" in the end even though the regex has a $.. So, I wrote one to check and substitute separately.

@dominiclajs: Try this:
Code:
echo "abcdaabcadgfaarstaba" | sed "s:\([^a]\)a\([^a]\):\1\2:g" | sed "s:^a\([^a]\)\|\([^a]\)a$:\1\2:g"


Last edited by balajesuri; 12-20-2011 at 02:40 AM..
 

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STR_IREPLACE(3) 							 1							   STR_IREPLACE(3)

str_ireplace - Case-insensitive version ofstr_replace(3).

SYNOPSIS
mixed str_ireplace (mixed $search, mixed $replace, mixed $subject, [int &$count]) DESCRIPTION
This function returns a string or an array with all occurrences of $search in $subject (ignoring case) replaced with the given $replace value. If you don't need fancy replacing rules, you should generally use this function instead of preg_replace(3) with the i modifier. PARAMETERS
If $search and $replace are arrays, then str_ireplace(3) takes a value from each array and uses them to search and replace on $subject. If $replace has fewer values than $search, then an empty string is used for the rest of replacement values. If $search is an array and $replace is a string, then this replacement string is used for every value of $search. The converse would not make sense, though. If $search or $replace are arrays, their elements are processed first to last. o $search - The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles. o $replace - The replacement value that replaces found $search values. An array may be used to designate multiple replacements. o $subject - The string or array being searched and replaced on, otherwise known as the haystack. If $subject is an array, then the search and replace is performed with every entry of $subject, and the return value is an array as well. o $count - If passed, this will be set to the number of replacements performed. RETURN VALUES
Returns a string or an array of replacements. EXAMPLES
Example #1 str_ireplace(3) example <?php $bodytag = str_ireplace("%body%", "black", "<body text=%BODY%>"); ?> NOTES
Note This function is binary-safe. Caution Replacement order gotcha Because str_ireplace(3) replaces left to right, it might replace a previously inserted value when doing multiple replacements. Example #2 in the str_replace(3) documentation demonstrates how this may affect you in practice. SEE ALSO
str_replace(3), preg_replace(3), strtr(3). PHP Documentation Group STR_IREPLACE(3)
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