regex for bitcointransaction string

[kangarooz]

Dear guys;

Is there any RegEx for checking if a string could be a valid bitcointransaction?
A currently use gettransaction() to check the confirmations of the transaction, as you may know gettransaction() only accepts txids made by the wallet of the bitcoind running this command, so I want to check the entered txid before, to catch as many faults as I can.
Programming language: Python

All the best;

[grue]

Is there any RegEx for checking if a string could be a valid bitcointransaction?

string as in what? the transaction id?

[kangarooz]

I got a string containing the "txid" which should be checked.

All the best;

[grue]

I got a string containing the "txid" which should be checked.

All the best;

the txid is the sha-1 hash of a transaction. you can't use the txid to determine whether a transaction is valid, because any 64 digit hexadecimal number can be a txid.

[telepatheic]

I got a string containing the "txid" which should be checked.

All the best;

the txid is the sha-1 hash of a transaction. you can't use the txid to determine whether a transaction is valid, because any 64 digit hexadecimal number can be a txid.

It's not the SHA-1 it is the SHA256d. Also quite confusingly, the output bytes are reversed when displayed to the user!

The RegEx you are looking for is:

Code:

/^[0-9a-f]{64}$/i 

[grue]

anyways, the best solution is to use getrawtransaction, which allows you to retrieve any transaction.

[fbueller]

anyways, the best solution is to use getrawtransaction, which allows you to retrieve any transaction.

Only if your bitcoin.conf has txindex=1 in it. And you've reindexed by running: ./bitcoind -reindex. That will let you run getrawtransaction() on any txid.

To get confirmations for the transaction, as well as the raw and decoded tx, you can use getrawtransaction(txid, 1);

[grue]

Only if your bitcoin.conf has txindex=1 in it. And you've reindexed by running: ./bitcoind -reindex. That will let you run getrawtransaction() on any txid.

To get confirmations for the transaction, as well as the raw and decoded tx, you can use getrawtransaction(txid, 1);

that's weird. because it works fine on my bitcoin core instance, and it doesn't have txindex enabled.