Re: question about reg. expression
| От | Stephen Belcher |
|---|---|
| Тема | Re: question about reg. expression |
| Дата | |
| Msg-id | AANLkTim9UYesBGU6fKf-sP6hcka8i45CyskKee9RPViJ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: question about reg. expression (Samuel Gendler <sgendler@ideasculptor.com>) |
| Ответы |
Re: question about reg. expression
|
| Список | pgsql-sql |
Another way to match multiple occurrences is to use curly brackets with a number, like:
select 'ab' ~ '^[a-z]{2}$';
It can be done with a range of numbers as well:
select 'ab' ~ '^[a-z]{2,4}$';
select 'abab' ~ '^[a-z]{2,4}$';
I believe, however, that the curly brackets notation was introduced in 9.0 and is not available in earlier versions.
--Stephen
On Wed, Jan 19, 2011 at 5:21 AM, Samuel Gendler <sgendler@ideasculptor.com> wrote:
I'd think you need to indicate multiple alphabetic matches. Your first regex actually matches only b followed by end of string and the second is really only matching start of string followed by a. The third is looking for a single character string.Try this: select 'ab' ~ '^[a-z]+$'or this: select 'ab' ~ '^[a-z]*$'or if looking only for 2 character strings: select 'ab' ~ '^[a-z][a-z]$'On Tue, Jan 18, 2011 at 3:41 PM, andrew1 <andrew1@mytrashmail.com> wrote:hi all,
these return t:
select 'ab' ~ '[a-z]$'
select 'ab' ~ '^[a-z]'
select 'ab' ~ '^[a-z]$' returns f
Can't I use ^ and $ at the same time to match, in this case?
thanks.
--
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