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Regular Expression
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((?<!\d)(?:\d{8}))_((?:\d{6})(?!\d))
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gm
Input 1
1
New
Patate_17890505_TitreEnCamelCase.ext EPFL_AlgebreLineaire TaxonomieProprietesFonctionsComplexes.v0.ipe.20210302_005606.pdf 1_ 12_ _1 _12 12345678_ _123456 12345678_12345 1234567_123456 1234567_12345 123456_12345 12345678_1234567 123456789_123456 123456789_1234567 _patate__truc__ ___ foo_12345678 foo_12345678_123456_bar 12345678_123456 foo12345678_123456bar
Substitution
$1.$2
Patate_17890505_TitreEnCamelCase.ext EPFL_AlgebreLineaire TaxonomieProprietesFonctionsComplexes.v0.ipe.20210302_005606.pdf 1_ 12_ _1 _12 12345678_ _123456 12345678_12345 1234567_123456 1234567_12345 123456_12345 12345678_1234567 123456789_123456 123456789_1234567 _patate__truc__ ___ foo_12345678 foo_12345678_123456_bar 12345678_123456 foo12345678_123456bar