Thread: Count occurrences of pattern in string

Hello,

I'm looking for a function to count the occurrences of a pattern in a
string. E.g. something like:

fun_count_pattern('fooXblaX', 'X')

which would
return 2 (I.e. pattern 'X' found 2 times in string 'fooXblaX').

I could write
my own function for this (probably using plpython?) but I was wandering whether
there is some function or combination of functions that I could use 'off-the-
shelf'.

Thanks very much

All the best

Dario

PS: I'm using PostgreSQL 8.3 on
Windows XP.

dario.ber@libero.it <dario.ber@libero.it> wrote:

> Hello,
>
> I'm looking for a function to count the occurrences of a pattern in a
> string. E.g. something like:
>
> fun_count_pattern('fooXblaX', 'X')
>
> which would
> return 2 (I.e. pattern 'X' found 2 times in string 'fooXblaX').

How about:

test=*# select length('fooXblaX') - length(regexp_replace('fooXblaX','X','','g')) / length('X');
 ?column?
----------
        2
(1 Zeile)



Andreas
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