# SeqID for Classifier Contain both numerical and alphabetical characters

**URL:** https://forum.qiime2.org/t/seqid-for-classifier-contain-both-numerical-and-alphabetical-characters/9907
**Category:** User Support
**Created:** [May 22, 2019, 5:02pm UTC](https://forum.qiime2.org/t/seqid-for-classifier-contain-both-numerical-and-alphabetical-characters/9907 "2019-05-22T17:02:06Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Nicholas\_Bokulich](https://forum.qiime2.org/user_avatar/forum.qiime2.org/nicholas_bokulich/32/19937_2.png) [@Nicholas\_Bokulich](https://forum.qiime2.org/u/Nicholas_Bokulich)
#### Post date: [May 22, 2019, 6:13pm UTC](https://forum.qiime2.org/t/seqid-for-classifier-contain-both-numerical-and-alphabetical-characters/9907/3 "2019-05-22T18:13:35Z")

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Welcome to the forum @aalex!

> [@aalex](#):
>
> How can I circumvent this?

See the awk script used in this tutorial:

> [@Fungal ITS analysis tutorial](https://forum.qiime2.org/t/fungal-its-analysis-tutorial/7351):
>
> Fungal ITS analysis, mock communities, and more fun NOTE: This tutorial was written in a QIIME 2 2018.11 environment. It is not guaranteed to work with earlier or later versions of QIIME 2. This tutorial was compiled as a working exercise for a [QIIME 2 workshop](https://workshops.qiime2.org/microbiome-bioinformatics-qiime-2-2018-12-12/) in December 2018, and does not represent the only possible fungal ITS workflow with QIIME 2, or even a benchmarked protocol recommendation. See other tutorials, e.g., the [q2-itsxpress tutorial](https://forum.qiime2.org/t/q2-itsxpress-a-tutorial-on-a-qiime-2-plugin-to-trim-its-sequences/5780) for other fungal ITS analysis options in QII…

> [@aalex](#):
>
> And what are the character requirements for using the classifier?

Uppercase valid nucleotide base codes (degenerate codes are accepted).

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