Validation pattern for strings
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A Validation Pattern can be set in the App Builder to ensure the user is inputting a parameter setting in the proper format. This will be present for input parameters that are strings.
Validation patterns are regular expressions, as described .
^ matches as the beginning of the string, $ matches at the end of the string. Using both will ensure the parameter value entered matches the entire string and not part of the string. + matches the previous pattern one or more times, * matches the previous pattern 0 or more times.
Here are some common examples:
Alphanumeric characters with underscores or dashes, but no spaces: ^[a-zA-Z0-9]+[_][-][a-zA-Z0-9]*$
Any file name with a fasta extension: ^\S+.fn?a(sta)?(.gz)?$
Any file name with a GTF extension: ^\S+.gtf(.gz)?$
A csv, tsv, or txt file: ^\S+.(csv|tsv|txt)$
