12-23-2008
Hi, I think it matches even before You get to the first character. [a-z]* means zero or more occurrences of any letter in the range a to z. And You have that whereever You search in any file. Sed stops when it has found a match. Maybe You were looking for something like
echo "abc 123 abc" | sed 's/[a-z]*/X/g'
or maybe even
echo "abc 123 abc" | sed 's/[a-z]/X/g'
where the g tells sed to continue searching for matches on the whole line.
/Lakris
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LEARN ABOUT PHP
is_string
IS_STRING(3) 1 IS_STRING(3)
is_string - Find whether the type of a variable is string
SYNOPSIS
bool is_string (mixed $var)
DESCRIPTION
Finds whether the type given variable is string.
PARAMETERS
o $var
- The variable being evaluated.
RETURN VALUES
Returns TRUE if $var is of type string, FALSE otherwise.
EXAMPLES
Example #1
is_string(3) example
<?php
$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
foreach ($values as $value) {
echo "is_string(";
var_export($value);
echo ") = ";
echo var_dump(is_string($value));
}
?>
The above example will output:
is_string(false) = bool(false)
is_string(true) = bool(false)
is_string(NULL) = bool(false)
is_string('abc') = bool(true)
is_string('23') = bool(true)
is_string(23) = bool(false)
is_string('23.5') = bool(true)
is_string(23.5) = bool(false)
is_string('') = bool(true)
is_string(' ') = bool(true)
is_string('0') = bool(true)
is_string(0) = bool(false)
SEE ALSO
is_float(3), is_int(3), is_bool(3), is_object(3), is_array(3).
PHP Documentation Group IS_STRING(3)