Re: How do I parse a telephone number?

Here's an answer that allows the use of spaces instead of dashes, or no spacing at all.

( $areacode, $exchange, $line ) = $phn =~ 
    m/(1[-| ]?)?\(?(\d{3})\)?[-| ]?(\d{3})[-| ]?(\d{4})/;
[download]

Works on strings such as the following:

212-555-1212
(212)555-1213
1-(212)-555-1214
1-212-555-1215
212 555 1216
(212) 555 1217
1 (212) 555 1218
1 212 555 1219
12125551210
[download]

Comment on Re: How do I parse a telephone number? Select or Download Code

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RE: Answer: How do I break down a phone number and rebuild it? by Ovid (Cardinal) on Jul 11, 2000 at 22:06 UTC
Actually, your regex, while good, has a slight problem. In a character class (something like `[a-zA-Z]`), the target text is filtered against each individual character in the class. No bar '\|' for alternation is necessary. Your class actually is testing for a dash, a bar, and a space, rather than alternating between dash and space. Here's this code slightly cleaned up: #!/usr/local/bin/perl -w use strict; while (<DATA>) { s /[\n\r]//g; print "Testing with $_, result is "; m/(?:1[- ]?)? # Testing for an leading 1 and dash or space behi +nd it \(? # Optional parentheses around the area code (\d{3}) # Area code \)? # Close optional parentheses around area code [- ]? # Optional dash or space after area code (\d{3}) # Exchange [- ]? # Optional dash or space after exchange (\d{4}) # Line /x; # /x modifier allows whitespace in a regex my $areacode = $1; my $exchange = $2; my $line = $3; print "($areacode) $exchange-$line\n"; } __DATA__ 212-555-1212 (212)555-1213 1-(212)-555-1214 1-212-555-1215 212 555 1216 (212) 555 1217 1 (212) 555 1218 1 212 555 1219 12125551210 [download] A couple of notes on the code: when single character alternates are allowed (that's not quite the same thing as single byte alternates), a character class is much faster than alternation. In other words, we're using `[- ]` rather than `(-\| )`. I also switched the first set of parentheses from `(1[- ]?)` to `(?:1[- ]?)`. The (?:someregex) construct allows for grouping without backreferencing to a $somenumber variable. This is more efficient than straight parentheses for grouping and should be used, when possible.	[reply] [d/l]

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RE: Answer: How do I break down a phone number and rebuild it?
by Ovid (Cardinal) on Jul 11, 2000 at 22:06 UTC

[a-zA-Z]

#!/usr/local/bin/perl -w

use strict;

while (<DATA>) {
    s /[\n\r]//g;

    print "Testing with $_, result is ";

    m/(?:1[- ]?)?    # Testing for an leading 1 and dash or space behi
+nd it
        \(?          # Optional parentheses around the area code
          (\d{3})    # Area code
        \)?          # Close optional parentheses around area code
        [- ]?        # Optional dash or space after area code
        (\d{3})      # Exchange
        [- ]?        # Optional dash or space after exchange
        (\d{4})      # Line
    /x;              # /x modifier allows whitespace in a regex

    my $areacode = $1;
    my $exchange = $2;
    my $line     = $3;

    print "($areacode) $exchange-$line\n";
}

__DATA__
212-555-1212
(212)555-1213
1-(212)-555-1214
1-212-555-1215
212 555 1216
(212) 555 1217
1 (212) 555 1218
1 212 555 1219
12125551210
[download]

quite

[- ]

(-| )

I also switched the first set of parentheses from (1[- ]?) to (?:1[- ]?). The (?:someregex) construct allows for grouping without backreferencing to a $somenumber variable. This is more efficient than straight parentheses for grouping and should be used, when possible.

[reply]
[d/l]