Get the string until first space

hi,
can anyone provide an example how to get the string until the first space?
i mean if the value is :
this is an example
how to get only the word "this" (before the very first space) by select?
thanks in advance,

There are several methods to achieve this:
SELECT SUBSTR(t.col1, 1, INSTR(t.col1 || ' ', ' ') - 1)
FROM (SELECT 'this is an example' col1
          FROM dual) t
     ;     or in 10g using regular expressions:
SELECT REGEXP_SUBSTR(t.col1, '^[^ ]+')
FROM (SELECT 'this is an example' col1
          FROM dual) t
     ;     C.

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