Regular Expressions 101

1st Alternative^b[0-9]{4}\K

^start of line

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

2nd Alternative[^a-z_]

Negated Character Class[^a-z_]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^b[0-9]{4}\K|[^a-z_]

New

b7001_cp---_parc1323546_venc.,?><_     fluxo