Regular Expressions 101

Explanation

Pro

1st Alternative(?<=\d)(?=\D)

Positive Lookbehind(?<=\d)

\da digit

Positive Lookahead(?=\D)

\Dany character that's not a digit

2nd Alternative(?<=\D)(?<!sha|md|^)(?=\d)

Positive Lookbehind(?<=\D)

\Dany character that's not a digit

Negative Lookbehind(?<!sha|md|^)

1st Alternativesha

shathe literal text sha (case sensitive)

2nd Alternativemd

mdthe literal text md (case sensitive)

3rd Alternative^

^start of line

Positive Lookahead(?=\d)

\da digit

3rd Alternative_

_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.

25 tokens

(?<=\d)(?=\D)|(?<=\D)(?<!sha|md|^)(?=\d)|_

New

test123
84test
test_md5
sha256
word_two_sha1
w0rd

test123
84test
test_md5
sha256
word_two_sha1
w0rd