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 <scolebou...@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 <pbened...@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 <scolebou...@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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