regex101: PCRE (Legacy) Substitution Workspace

Pro

1st Alternative(\d)(?=\d*:)(?=.{8}(.))((?=(1|.(?=.{8}1))*?1.{8}1\d*~.(1))|(?=.*?~(0)))(?=.*?~.*?\1\2(\5|\6)_(.))

Group 1(\d)

\da digit

Positive Lookahead(?=\d*:)

\d*a digit, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=.{8}(.))

.{8}any character (except for line terminators), repeated exactly 8 times

Group 2(.)

.any character (except for line terminators)

Group 3((?=(1|.(?=.{8}1))*?1.{8}1\d*~.(1))|(?=.*?~(0)))

1st Alternative(?=(1|.(?=.{8}1))*?1.{8}1\d*~.(1))

Positive Lookahead(?=(1|.(?=.{8}1))*?1.{8}1\d*~.(1))

Group 4(1|.(?=.{8}1))*?

*?repeats the group contents below any number of times:

1st Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative.(?=.{8}1)

.any character (except for line terminators)

Positive Lookahead(?=.{8}1)

.{8}any character (except for line terminators), repeated exactly 8 times

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

.{8}any character (except for line terminators), repeated exactly 8 times

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\d*a digit, repeated any number of times

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

.any character (except for line terminators)

Group 5(1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative(?=.*?~(0))

Positive Lookahead(?=.*?~(0))

.*?any character (except for line terminators), repeated any number of times

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

Group 6(0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Positive Lookahead(?=.*?~.*?\1\2(\5|\6)_(.))

.*?any character (except for line terminators), repeated any number of times

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

.*?any character (except for line terminators), repeated any number of times

\1the text saved by group 1

\2the text saved by group 2

Group 7(\5|\6)

1st Alternative\5

\5the text saved by group 5

2nd Alternative\6

\6the text saved by group 6

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 8(.)

.any character (except for line terminators)

2nd Alternative:.*

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.*any character (except for line terminators), repeated any number of times

Global pattern flags

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

25 tokens

Regular Expression

(\d)(?=\d*:)(?=.{8}(.))((?=(1|.(?=.{8}1))*?1.{8}1\d*~.(1))|(?=.*?~(0)))(?=.*?~.*?\1\2(\5|\6)_(.))|:.*

New

01101100:01010100~01000_0001_1010_1100_1011_0110_0101_0111_1

Substitution

$8

01101100:01010100~01000_0001_1010_1100_1011_0110_0101_0111_1