Re^2: Regex to match multiple words in an email subject

[jwkrahn]

in reply to Re: Regex to match multiple words in an email subject
in thread Regex to match multiple words in an email subject

    print /(?:SSL|SSL Certificate|VASCO)/ ? "Match\n" : "No match\n";

Because the pattern is not anchored at either end the string 'SSL Certificate' will never match.

$ perl -le'
my @strings = (
    "SSL",
    "SSL Certificate",
    "VASCO",
    "something else",
    );
for ( @strings ) {
    print $1 if /(SSL|SSL Certificate|VASCO)/;
    }
'
SSL
SSL
VASCO

With no anchors you need to put the longer strings first:

$ perl -le'
my @strings = (
    "SSL",
    "SSL Certificate",
    "VASCO",
    "something else",
    );
for ( @strings ) {
    print $1 if /(SSL Certificate|SSL|VASCO)/;
    }
'
SSL
SSL Certificate
VASCO

[philipbailey]

That's a good point, but in the OP's use case it's irrelevant. In fact, the regex could be trimmed down to:

/(SSL|VASCO)/

Or, to avoid unnecessary capturing:

/(?:SSL|VASCO)/

[JavaFan]

Or, in the OPs case:

/SSL|VASCO/