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How to check if string is a valid postgres name?

By : Kyu
Date : July 29 2020, 12:00 PM
around this issue You can use the function quote_ident() which will quote a string only if necessary.
So if the "quoted" value is the same as the input, it's a legal identifier:
code :
select quote_ident('foobar') = 'foobar'
select quote_ident('foo bar') = 'foo bar'

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How can I create a constraint to check if an email is valid in postgres?

By : Mamouz
Date : March 29 2020, 07:55 AM
To fix the issue you can do How can I create a constraint to use a regular expression in postgres?
code :
    email varchar
    CONSTRAINT proper_email CHECK (email ~* '^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+[.][A-Za-z]+$')

Java check if a string is valid JSON or valid XML or neither

By : Vimal Raman
Date : March 29 2020, 07:55 AM
Hope that helps youre right in that to really see if something is json or xml you must try and parse it as such - there's no "flat string" solution to this (see very famous related question here)
the only area of improvement i could think of here is in performance of the parsing:

Postgres check if column name is valid

By : Vishwanath Gudisagar
Date : March 29 2020, 07:55 AM
it fixes the issue Not exactly the same thing, but an "illegal" identifier has to be quoted in Postgres (and SQL). The function format() has a special place holder for identifiers and will return a quoted identifier if anything is non-standard:
So select format('%I', 'foo') returns foo.

How to check if directory is valid Postgres database

By : user2555086
Date : March 29 2020, 07:55 AM
I hope this helps you . If the file /var/lib/postgresql/data/PG_VERSION exists, then it's probably a valid data directory. This is the first thing Postgres will check when you try to start the server.
Of course, there are many, many other things required to make it a valid data directory - too many to check by yourself. If you need to be 100% sure, the only practical way is to start the Postgres server and try to connect to it.

how to check a string is valid in ruby? A valid string will be only including either character or digital number OR both

By : b0x11
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You're on the right track. You'll just want to use a regular expression to figure out which characters to accept/reject.
something like this would accept all lowercase and uppercase alphabet characters.
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