Regular Expressions 101

\d{4}a digit, repeated exactly 4 times

Group 1(\d{3})

\d{3}a digit, repeated exactly 3 times

\1the text saved by group 1

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

\d{4}(\d{3})\1

New

Note - I don't need spaces in between. Pattern 1: Number: 3527432432 Let's consider the above number as ABCD XYZ XYZ pattern

Pattern 2: Number: 3527898989 ABCD XY XY XY

Pattern 3: Number: 3535358745 XY XY XY ABCD

Pattern 4: 5432888999 ABCD XXX YYY

Pattern 5: 5432888899 ABCD XXXX YY

Pattern 65432334422 ABCD XX YY ZZ

Regular Expression

Substitution