From: "Mark Williams" <markwillimas@gmail.com>
To: "'Tom Lane'" <tgl@sss.pgh.pa.us>
Cc: "'A. Sasaki'" <asasaki@gmail.com>,
	<pgsql-sql@lists.postgresql.org>
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In-Reply-To: <3966.1541361307@sss.pgh.pa.us>
Subject: RE: Regular Expressions
Date: Sun, 4 Nov 2018 20:02:44 -0000
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Thanks all. Have implemented by way of "AND" for time being. Full text
search on my list of todos!

__

-----Original Message-----
From: Tom Lane <tgl@sss.pgh.pa.us> 
Sent: 04 November 2018 19:55
To: Mark Williams <markwillimas@gmail.com>
Cc: 'A. Sasaki' <asasaki@gmail.com>; pgsql-sql@lists.postgresql.org
Subject: Re: Regular Expressions

"Mark Williams" <markwillimas@gmail.com> writes:
> Also, what would be the regular expression if you want to check whether
all the words were in the field where you had say 10 words/phrases you
wanted to check for?

As David said, regular expressions aren't really designed to do that.
Personally I'd do the AND at the SQL level, ie

myfield ~* '\mtext1\M' AND myfield ~* '\mtext2\M' AND ...

You might also take a look at the full text search machinery, which is
probably better suited to this task.

			regards, tom lane