regex101: PCRE (Legacy) Match Workspace

^start of line

Begin:the literal text Begin: (case sensitive)

.*any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\R(?!ModelFinish).*)*

*repeats the group contents below any number of times:

\Ra newline sequence

Negative Lookahead(?!ModelFinish)

ModelFinishthe literal text ModelFinish (case sensitive)

.*any character (except for line terminators), repeated any number of times

Positive Lookahead(?=\RSaving)

\Ra newline sequence

Savingthe literal text Saving (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Search reference

Regular Expression

^Begin:.*(?:\R(?!ModelFinish).*)*(?=\RSaving)

New

Begin: model 17
Epoch 15800, loss 4051304.017, val_PMAE 6.9
Saving at epoch 15828 with loss: 3974847.290
Saving at epoch 15889 with loss: 3968749.471
ModelFinish: Stop training
Begin: model 18
Saving at epoch 15889 with loss: 3968749.223
Saving at epoch 15889 with loss: 3968749.200
Epoch 15800, loss 4051304.017
ModelFinish: Stop training
Begin: model 19
Saving at epoch 15889 with loss: 3968749.223
Saving at epoch 15889 with loss: 3968749.200
Saving at epoch 15889 with loss: 3968749.200
Saving at epoch 15889 with loss: 3968749.200
Saving at epoch 15889 with loss: 3968749.200
Saving at epoch 15889 with loss: 3968749.200
Saving at epoch 15889 with loss: 3968749.200
Epoch 15800, loss 4051304.017
ModelFinish: Stop training

Regular Expressions 101

Regular Expression

Extraction