Regular Expressions 101

Group file(?<file>(?<subject>\d{4})_(?<COND>[A-Z]{2})_(?<EOEC>EO|EC)_?(?<inx>\d)?)

Group subject(?<subject>\d{4})

\d{4}a digit, repeated exactly 4 times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group COND(?<COND>[A-Z]{2})

Character Class[A-Z]{2}

{2}matches exactly 2 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group EOEC(?<EOEC>EO|EC)

1st AlternativeEO

EOthe literal text EO (case sensitive)

2nd AlternativeEC

ECthe literal text EC (case sensitive)

_?optionally matches the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group inx(?<inx>\d)?

?repeats the group contents below at most once:

\da digit

Group ext(?<ext>\.\w{3,4})

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w{3,4}any word character, repeated between 3 and 4 times

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<file>(?<subject>\d{4})_(?<COND>[A-Z]{2})_(?<EOEC>EO|EC)_?(?<inx>\d)?)(?<ext>\.\w{3,4})

New

0001_BL_EC.mat 
1_BL_EC.mat 

1231_NF_EO.mat 

1231_NF_EO_1.mat

S0001_NF_EO_Matrix