DigitalVolcano Software Support

Posted: **Wed Mar 26, 2025 5:09 pm**

Build 4.0.0.1 BETA

Steps to reproduce:
1) Create a text file, "test.txt", with the following content:

The quick brown fox jumped over the 123 lazy dogs.

2) Under Settings > Regular Expression engine:

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Engine: PCRE2

3) Under Find & Replace > Regular Expression:

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Reg Ex: ([0-9]+)
Replace: \1\1

4) Ensure that the Preview window is visible and "Preview replacements" is unchecked (disabled) and that the option, "Generate preview for all matches" is checked (enabled). Click "Replace".

Expected output in the Preview window after clicking "Replace":

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X:\test.txt 
      2   123123 lazy dogs.

Actual output in the Preview window after clicking "Replace":

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X:\test.txt 
      2   123123123123 lazy dogs.

If I open "test.txt", it does show that the file was properly processed (below), it's just that the Preview window is incorrect:

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The quick brown fox jumped over the 123123 lazy dogs.

*I'm not sure what that leading "2" in the gutter is either.

Posted: **Wed Mar 26, 2025 5:16 pm**

I just realized this might not be a bug as "Generate preview for all matches" when checked is properly showing 123123123123 as it's reading the change from 123 -> 123123 (and \1\1 from that regex applied to 123123 -> 123123123123).

DigitalVolcano Software Support

TC4 Bug: Incorrect "Preview" with PCRE2 + capture group

TC4 Bug: Incorrect "Preview" with PCRE2 + capture group

Re: TC4 Bug: Incorrect "Preview" with PCRE2 + capture group