Regular Expressions 101

Pro

1st Alternative(^(test)?_)

Group 1(^(test)?_)

^start of line

Group 2(test)?

?repeats the group contents below at most once:

testthe literal text test (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

2nd Alternative((T|t)ests$)

Group 3((T|t)ests$)

Group 4(T|t)

1st AlternativeT

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

2nd Alternativet

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

eststhe literal text ests (case sensitive)

$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.

25 tokens

(^(test)?_)|((T|t)ests$)

New

RoundConserved
UtilsTests
utilstests
test_foo_bar_bar
_test
test_something_tests
_Utils
Test_Foo
test_Foo
UtilsTests
test_function_name
_foo
my_tests

RoundConserved
UtilsTests
utilstests
test_foo_bar_bar
_test
test_something_tests
_Utils
Test_Foo
test_Foo
UtilsTests
test_function_name
_foo
my_tests