Select where (upper(xy)~'.CH'); ..matches also SPACE CH

Marcel (marcel(at)simmcomm(dot)ch) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
Select where (upper(xy)~'.CH'); ..matches also SPACE CH

Long Description
There exists a problem with the ~ statement. The codesample and the text is from an adult contact database.

The compare string .CH matches the word 'EINEN CHANCE' in the sentence. Seems to be, that the . will match the space between the words. This doesn't happen, if you replace .CH with _CH or something else.

Sample Code
meetingpoint=> select upper(adtext) from ads where adnumber='40ac066e1db0633a' and (upper(adtext)~'.CH');
upper

--------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------
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WELCHE DOMINA WILL SICH EINEN SKLAVEN HALTEN. BIN EIN 29-JHRIGER]BI-BOY UND SEHR DEVOT. BITTE GEB
EN SIE MIR EINEN CHANCE DAMIT ICH IHNEN]BEWEISEN KANN DASS ICH IHR SKLAVE SEIN WERDE UND NUR FR S
IE BEREIT BIN]ALLES ZU MACHEN WAS SIE VON MIR VERLANGEN.]UNTERTNIGST IHR SKLAVE]
(1 row)

meetingpoint=> select upper(adtext) from ads where adnumber='40ac066e1db0633a' and (upper(adtext)~'_CH');

upper
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(0 rows)

meetingpoint=>

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