MRT: How to change "February_03" to "02_03" ?

[nn1k3]

How might I use regex in the Multi-Rename Tool to change a filename like February_03_2023.pdf to 02_03_2023.pdf?
FYI, I did read www.ghisler.ch/wiki/index.php/Regular_Expressions but am baffled by the results I am getting. Sorry.

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Post split from viewtopic.php?p=437265#p437265
2nn1k3, please don't mix topics, search for an better fitting thread or create a new thread for each different question. Thanks

[Stefan2]

2nn1k3
- select the files
- open MRT
- press the F1-key and read:
Search & Replace
You can search+replace multiple strings in one step! The strings need to be separated by the vertical line (Alt+124).
Example: Replace Umlauts+Accents:
Search for: ä|ö|ü|é|è|ê|à Replace with: ae|oe|ue|e|e|e|a


So,
Search for: January|February|March
Replace with: 01|02|03