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given and when - a switchlike syntax
More Loops and Conditionals example from a Well House Consultants training course
More on More Loops and Conditionals [link]
Source code: pswit Module: P206
use feature ":5.10";
print "Please enter your postal or zip code: "; chop ($pc = <STDIN>); # Clean off leading and trailing spaces $pc =~ s/^\s+//; $pc =~ s/\s+$//; given (uc($pc)) { when ("") { say ("You didn't enter anything"); } when (/^[A-Z]{1,2}[0-9][0-9A-Z]?\s+\d[A-Z]{2}$/) { say ("That's the format for a British postcode"); } when (/^\d{5}([-\s]+\d{4})$/) { say ("That's a USA zipcode"); } when (/^([A-Z]{2}\s+)?[A-Z]\d[A-Z]\s+\d[A-Z]\d$/) { say ("That's a Canadian postcode"); } when (/^\d{4}\s+[A-Z]{2}$/) { say ("Perhaps the Netherlands?"); } when (/^\d{4}$/) { say ("Could be Albania ..."); continue; } # Continue to check the possibilities! when ("ASCN 1ZZ") { say ("That's Ascension Island"); } when (/^\d{4}$/) { say ("Could be Austria ..."); } when (/^\d{4}$/) { say ("Could be Australia ..."); } when ("BIQQ 1ZZ") { say ("That's the British Antarctic Territory"); } when ("BBND 1ZZ") { say ("That's the British Indian Ocean Territory"); } when ("FIQQ 1ZZ") { say ("That's the Falkland Islands"); } when ("PCRN 1ZZ") { say ("That's the Pitcairn Islands"); } when ("STHL 1ZZ") { say ("That's St. Helena"); } when ("TDCU 1ZZ") { say ("That's Tristan da Cunha"); } when ("TKCA 1ZZ") { say ("That's the Turks and Caicos Islands"); } when ("SIQQ 1ZZ") { say ("That's South Georgia and the South Sandwich Islands"); } default { say ("Not one of the regular formats we know"); } } __END__ Sample output: wizard:ps10 graham$ perl pswit Please enter your postal or zip code: SN12 7NY That's the format for a British postcode wizard:ps10 graham$ perl pswit Please enter your postal or zip code: 77443-6644 That's a USA zipcode Please enter your postal or zip code: 3333 Could be Albania ... Could be Austria ... wizard:ps10 graham$ perl pswit Please enter your postal or zip code: H0H 0H0 That's a Canadian postcode wizard:ps10 graham$ perl pswit Please enter your postal or zip code: You didn't enter anything wizard:ps10 graham$ perl pswit Please enter your postal or zip code: TDCU 1ZZ That's Tristan da Cunha wizard:ps10 graham$ Learn about this subject
This module and example are covered on the following public courses:
* Perl Programming * Perl bootcamp * Learning to program in Perl * Perl Programming Also available on on site courses for larger groups Books covering this topic
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This example comes from our "More Loops and Conditionals" training module. You'll find a description of the topic and some
other closely related examples on the "More Loops and Conditionals" module index page.
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