{"id":13182,"date":"2015-11-23T00:33:51","date_gmt":"2015-11-23T00:33:51","guid":{"rendered":"http:\/\/www.oracletutoring.ca\/blog\/?p=13182"},"modified":"2015-11-23T00:33:51","modified_gmt":"2015-11-23T00:33:51","slug":"perl-regular-expression-explanation","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/perl-regular-expression-explanation\/","title":{"rendered":"Perl: regular expression explanation"},"content":{"rendered":"

The tutor follows up on his post about the variable password checker.<\/h1>\n

In my Nov 18<\/a> post I show a short script that checks a three-digit entry for a match with the pattern m[any character]m<\/span>. The entry m4m<\/span> is a match, for example. However, m4mi<\/span> is not a match (too long). Neither is tom<\/span>; it doesn’t follow m[character]m<\/span>.<\/p>\n

The code that can distinguish the pattern<\/p>\n

m[any character]m<\/span><\/p>\n

is<\/p>\n

if ($word=~\/^n.n$\/){
\nprint “correct”;
\n}
\n<\/span><\/p>\n

The =~<\/span> means “contains match”. The period in the middle means “any single character”. The ^<\/span> means the match must occur at the beginning of $word<\/span>, while the $<\/span> means it must occur at the end. Therefore, the string can only be three characters long.<\/p>\n

HTH:)<\/p>\n

Source:<\/p>\n

McGrath, Mike. Perl in easy steps<\/u>. Southam: Computer Step, 2004.<\/p>\n

Robert’s Perl tutorial<\/a><\/p>\n

Jack of Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.<\/p>\n","protected":false},"excerpt":{"rendered":"

The tutor follows up on his post about the variable password checker. In my Nov 18 post I show a short script that checks a three-digit entry for a match with the pattern m[any character]m. The entry m4m is a …<\/p>\n

Perl: regular expression explanation<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[1201,173,709],"class_list":["post-13182","post","type-post","status-publish","format-standard","hentry","category-computer-science","tag-pattern-matching","tag-perl-programming","tag-regular-expressions"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/13182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=13182"}],"version-history":[{"count":14,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/13182\/revisions"}],"predecessor-version":[{"id":13196,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/13182\/revisions\/13196"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=13182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=13182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=13182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}