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Regular Expressions in PHP - from simple yes/no to ancilliary responses
Regular Expression Cookbook example from a Well House Consultants training course
More on Regular Expression Cookbook [link]
Source code: ex1.php Module: Q806
<?php
# Regular Expressions in PHP - from simple yes/no to ancilliary responses $line = "I live at SN12 6QL which is just up the road from here and in 2 weeks train near E3 4HC in London?"; $result = preg_match('/[A-Z]{1,2}/',$line); # Matches the "I" at the start (oops - surprise!) print ("1. Result is $result\n"); $result = preg_match('/^[A-Z]{1,2}/',$line); print ("2. Result is $result\n"); $result = preg_match('/^[A-Z]{1,2}[0-9][0-9A-Z]{0,1}/',$line); # FAILS - not postcode at start print ("3. Result is $result\n"); $result = preg_match('/[A-Z]{1,2}[0-9][0-9A-Z]{0,1}/',$line); print ("4. Result is $result\n"); $result = preg_match('/[A-Z]{1,2}[0-9][0-9A-Z]{0,1} {1,}[0-9]{1}[A-Z]{2}/',$line); print ("5. Result is $result\n"); # Thus far, it's a "yes / no" answer. But WHAT matches? $result = preg_match('/[A-Z]{1,2}[0-9][0-9A-Z]{0,1} {1,}[0-9]{1}[A-Z]{2}/',$line,$gotten); print ("6. Result is $result. Side result $gotten[0]\n"); # First postcode (only) is returned $result = preg_match_all('/[A-Z]{1,2}[0-9][0-9A-Z]{0,1} {1,}[0-9]{1}[A-Z]{2}/',$line,$gotten); print ("7. Result is $result. Side result ". $gotten[0][0] .", " . $gotten[0][1] ."\n"); # Each postcode returned function spew2d($thing) { print "\n"; for ($k=0; $k<count($thing); $k++) { for ($j=0; $j<count($thing[$k]); $j++) { print " $k/$j: ".$thing[$k][$j]; } print "\n"; } } $result = preg_match_all('/([A-Z]{1,2})[0-9][0-9A-Z]{0,1} {1,}[0-9]{1}[A-Z]{2}/',$line,$gotten); print ("8. Result is $result. Side result "); spew2d($gotten) ; # Returns group as well $result = preg_match_all('/(([A-Z]{1,2})[0-9][0-9A-Z]{0,1}) {1,}([0-9]{1}[A-Z]{2})/',$line,$gotten); print ("9. Result is $result. Side result "); spew2d($gotten) ; # Returns multiple groups # Use some alternative groups and counts $result = preg_match_all('/(([A-Z]{1,2})\d[0-9A-Z]?) +(\d[A-Z]{2})/',$line,$gotten); print ("10. Result is $result. Side result "); spew2d($gotten) ; $inbound = '[A-Z]{1,2}[0-9][0-9A-Z]{0,1}'; # Inbound section of postcode $space = '\s+'; # mid-postcode space separator $outbound = '[0-9]{1}[A-Z]{2}'; # Delivery round information $pattern = "/" . $inbound . $space . $outbound . "/"; $result = preg_match($pattern,$line); print ("11. Neater - $result\n"); /* Sample output -------------------------------------------- munchkin:re grahamellis$ php ex1.php 1. Result is 1 2. Result is 1 3. Result is 0 4. Result is 1 5. Result is 1 6. Result is 1. Side result SN12 6QL 7. Result is 2. Side result SN12 6QL, E3 4HC 8. Result is 2. Side result 0/0: SN12 6QL 0/1: E3 4HC 1/0: SN 1/1: E 9. Result is 2. Side result 0/0: SN12 6QL 0/1: E3 4HC 1/0: SN12 1/1: E3 2/0: SN 2/1: E 3/0: 6QL 3/1: 4HC 10. Result is 2. Side result 0/0: SN12 6QL 0/1: E3 4HC 1/0: SN12 1/1: E3 2/0: SN 2/1: E 3/0: 6QL 3/1: 4HC 11. Neater - 1 munchkin:re grahamellis$ -------------------------------------------- */ ?> Learn about this subject
This module and example are covered on our public Regular Expressions course. If you have a group of
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This example comes from our "Regular Expression Cookbook" training module. You'll find a description of the topic and some
other closely related examples on the "Regular Expression Cookbook" module index page.
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