> From: Eric Walker [mailto:[EMAIL PROTECTED]
> Sent: Friday, November 21, 2003 1:34 PM
> Subject: search
>
>
> I am trying to search a string for a "[]". I want to count the amount
> of "[]" in the string.
>
> Any IDeas....
perldoc -q count
gives you:
How can I count the number of occurrences of a substring within a string?
There are a number of ways, with varying efficiency. If you want
a count of a certain single character (X) within a string, you
can use the "tr///" function like so:
$string = "ThisXlineXhasXsomeXx'sXinXit";
$count = ($string =~ tr/X//);
print "There are $count X characters in the string";
This is fine if you are just looking for a single character.
However, if you are trying to count multiple character
substrings within a larger string, "tr///" won't work. What you
can do is wrap a while() loop around a global pattern match. For
example, let's count negative integers:
$string = "-9 55 48 -2 23 -76 4 14 -44";
while ($string =~ /-\d+/g) { $count++ }
print "There are $count negative numbers in the string";
You want the second example, but you want to use /\[\]/g as your pattern
match.
/\/\ark
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