Regular Expressions 101

Non-Capturing Group(?:^\d{6}|=\d{7}|\G)

1st Alternative^\d{6}

^start of line

\d{6}a digit, repeated exactly 6 times

2nd Alternative=\d{7}

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\d{7}a digit, repeated exactly 7 times

3rd Alternative\G

\Gstart of current search

Positive Lookahead(?=\d{5,8}=|\d*$)

1st Alternative\d{5,8}=

\d{5,8}a digit, repeated between 5 and 8 times

=the literal = (61₁₀ / 75₈ / 3D₁₆)

2nd Alternative\d*$

\d*a digit, repeated any number of times

$end of line

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

\da digit

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

Regular Expression

(?:^\d{6}|=\d{7}|\G)(?=\d{5,8}=|\d*$)\K\d

New

12345678999999=654784651321
4567894135=456789211
123=0123456789
0123456789=123
0123456789123=123

12345678999999=654784651321
4567894135=456789211
123=0123456789
0123456789=123
0123456789123=123