07-27-2009
case-insensitive if on substring
I'd like to print a line if a substring is matched in a case insensitive manner
something like do a case insensitive search for ABCD as a substring:
awk '{ if (substr($1,1,4) == "[Aa][Bb][Cc][Dd]") print $1 }' infile > outfile
I'm not certain how to make the syntax work???
Thanks
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STRIPOS(3) 1 STRIPOS(3)
stripos - Find the position of the first occurrence of a case-insensitive substring in a string
SYNOPSIS
mixed stripos (string $haystack, string $needle, [int $offset])
DESCRIPTION
Find the numeric position of the first occurrence of $needle in the $haystack string.
Unlike the strpos(3), stripos(3) is case-insensitive.
PARAMETERS
o $haystack
- The string to search in.
o $needle
- Note that the $needle may be a string of one or more characters. If $needle is not a string, it is converted to an integer and
applied as the ordinal value of a character.
o $offset
- If specified, search will start this number of characters counted from the beginning of the string. Unlike strrpos(3) and strri-
pos(3), the offset cannot be negative.
RETURN VALUES
Returns the position of where the needle exists relative to the beginnning of the $haystack string (independent of offset). Also note that
string positions start at 0, and not 1.
Returns FALSE if the needle was not found.
Warning
This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the return value of this function.
EXAMPLES
Example #1
stripos(3) examples
<?php
$findme = 'a';
$mystring1 = 'xyz';
$mystring2 = 'ABC';
$pos1 = stripos($mystring1, $findme);
$pos2 = stripos($mystring2, $findme);
// Nope, 'a' is certainly not in 'xyz'
if ($pos1 === false) {
echo "The string '$findme' was not found in the string '$mystring1'";
}
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' is the 0th (first) character.
if ($pos2 !== false) {
echo "We found '$findme' in '$mystring2' at position $pos2";
}
?>
NOTES
Note
This function is binary-safe.
SEE ALSO
mb_stripos(3), strpos(3), strrpos(3), strripos(3), stristr(3), substr(3), str_ireplace(3).
PHP Documentation Group STRIPOS(3)