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From sebb <seb...@gmail.com>
Subject Re: [lang] Wildcard regex
Date Sat, 09 Oct 2010 11:25:59 GMT
What does the regex represent? A filename?

If so, then maybe the code belongs in IO rather than Lang.

Also, filename globbing is not consistent across OSes.

On 8 October 2010 15:32, Stephen Colebourne <scolebourne@joda.org> wrote:
> Human users enter wildcards * and ? (because regex is too complex). In
> my case, I'm passing it to MongoDB, which needs regex.
>
> Stephen
>
>
> On 8 October 2010 15:10, Paul Benedict <pbenedict@apache.org> wrote:
>> Can I get some sense of use case? What would you use it for? Just curious.
>>
>> On Fri, Oct 8, 2010 at 9:06 AM, Stephen Colebourne <scolebourne@joda.org> wrote:
>>> I don't think comons lang has a routine for converting a standard
>>> wildcard string (with * and ?) to a regex.
>>> Here is a first suggestion, although I'm sure it can be improved.
>>>
>>>  public Pattern createPattern(String text) {
>>>    StringTokenizer tkn = new StringTokenizer(text, "?*", true);
>>>    StringBuilder buf = new StringBuilder(text.length() + 10);
>>>    buf.append('^');
>>>    boolean lastStar = false;
>>>    while (tkn.hasMoreTokens()) {
>>>      String str = tkn.nextToken();
>>>      if (str.equals("?")) {
>>>        buf.append('.');
>>>        lastStar = false;
>>>      } else if (str.equals("*")) {
>>>        if (lastStar == false) {
>>>          buf.append(".*");
>>>        }
>>>        lastStar = true;
>>>      } else {
>>>        buf.append(Pattern.quote(str));
>>>        lastStar = false;
>>>      }
>>>    }
>>>    buf.append('$');
>>>    return Pattern.compile(buf.toString(), Pattern.CASE_INSENSITIVE);
>>>  }
>>>
>>> Other possile conversions would be * and ? to databse wildcards, so
>>> perhaps there is scope for a few related methods here?
>>>
>>> Stephen
>>>
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>>>
>>
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>>
>
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