----- Original Message -----
From: "chen li" <[EMAIL PROTECTED]>
Hi all,
Here is my problem:
my $string="chen schen";
I want to use regular expression to find the exact
match in the string. So when I want to match "chen" I
expect "chen" only.
But use the following line I get both "chen" and
"schen" at the same time.
$string=~/chen/g;
How do I get what I expect?
Hi Chen
You can get the results by adding a \b before and after your reg expression.
\b is a boundary between a word and a non-word character. (A word character
is a-z, A-Z, 0-9, or underscore, _).So, for your example, schen wouldn't
match then because the 's' preceding 'c' is a word character and so the \b
wouldn't be true. But, it would match chen because the (non) character
(beginning of the string) preceding the 'c' would make \b true.
$string=~/\bchen\b/g;
MATCH
"chen "
"#chen"
"here is a chen and another chen"
"chen's" (the apostrophy is a non-word char)
NO MATCH
"schen"
"chens"
Chris
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