Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Interesting approach for which ++.

.oO, however, that this allows cases such as when @testdata contains aabc. IMO that's NOT quite1 (strictly) prohibited by the (very loose) specs from OP:

Can anybody help to have a regular expression that checks that a,b and c occur in a string in any order.
SO, the valid strings are abc, bca, cab, cba, bac, acb...
Invalid strings are aab, abbc, acc etc.

BUT the presence of abbc in the list of invalid strings suggests that isha may want to requires that each permitted letter occur only once. (Others may well infer differently. As noted, I consider the spec to be imprecise... as is, ISTM, the general case when specs are written by example.)

1. because, in this case, while the initial "a" is doubled the $test does include an instance of each acceptable character; in other words, ISTM that aabc is NOT - strictly - prohibited in the sample of invalid strings, aab because aab can be read as prohibiting only an incomplete set of the chars a, b and c, while the invalid string abbc does not strictly prohibit having the lead character doubled. Am I being pedantic or fuzzy-brained?

I do find my own observations to fall short of precision+clarity. Maybe it's too early in the AM... :-)

#! /usr/bin/perl -w use strict; my @testdata = qw (abc aabc cba cab bac bba cbc bbc abcdefg 0a2c3bc); foreach (@testdata) { my $test = join '', sort split //, lc $_; $test =~ /[^a]*abc(?!c)[^c]*/ ? print "Matched $_\n" : print "Didn +'t match $_\n";

Output:
Matched abc
Matched aabc     <=
Matched cba
....

Update: added the missing close-paren at the end of para 3


In reply to Re^2: REgular expression to check the string that allows "a","b" and "c" to occur only once in any order. by ww
in thread REgular expression to check the string that allows "a","b" and "c" to occur only once in any order. by isha

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others imbibing at the Monastery: (5)
As of 2024-03-29 07:49 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found