Regular Expressions 101

Positive Lookbehind(?<=\s|^)

1st Alternative\s

\sany whitespace character

2nd Alternative^

^start of line

Non-Capturing Group(?:[\d_]\S+|\S*[%@#$]\S*)

1st Alternative[\d_]\S+

Character Class[\d_]

\da digit

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\S+any non-whitespace character, repeated at least once

2nd Alternative\S*[%@#$]\S*

\S*any non-whitespace character, repeated any number of times

Character Class[%@#$]

%the literal % (37₁₀ / 45₈ / 25₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

\S*any non-whitespace character, repeated any number of times

Positive Lookahead(?=\s|$)

1st Alternative\s

\sany whitespace character

2nd Alternative$

$end of line

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

(?<=\s|^)(?:[\d_]\S+|\S*[%@#$]\S*)(?=\s|$)

New

3testData
_testData
%data%
test%BIN%data this is #etst
test_Data3


3testData
_testData
%data%
test%BIN%data
test%BIN%data
te$t&$#@daTa