DOCK-2533-followup: Fix regex in Register Workflow dialog

[hyunnaye]

Description
This PR fixes the regex issues found in the "Register workflow" dialog.
Similar to this PR, this error was only shown on the FireFox console due to the v-mode flag.

Review Instructions
Editing the Workflow Path in the Register Workflow dialog (Register custom remote workflows option) should not show any Unable to check input pattern errors.

Issue
https://ucsc-cgl.atlassian.net/browse/DOCK-2533

Security
If there are any concerns that require extra attention from the security team, highlight them here.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.67%. Comparing base (b88e89e) to head (b1f2324).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2028   +/-   ##
========================================
  Coverage    41.67%   41.67%           
========================================
  Files          394      394           
  Lines        12315    12315           
  Branches      2959     2959           
========================================
  Hits          5132     5132           
- Misses        4858     4859    +1     
+ Partials      2325     2324    -1     

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[coverbeck]

No need to change, and it was like this, but except for Snakemake, the bulk of the pattern, except the file extension part, is the same 5 times. If you had a constant somewhere, you'd only have to change it once.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud