Regular Expressions 101

Pro

^start of line

Dearthe literal text Dear (case sensitive)

\s*any whitespace character, repeated any number of times

userthe literal text user (case sensitive)

\s*any whitespace character, repeated any number of times

Positive Lookahead(?=\S)

\Sany non-whitespace character

Group 1(.{1,5}.{1,5})

.{1,5}any character (except for line terminators), repeated between 1 and 5 times

thanksthe literal text thanks (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.

26 tokens

^Dear\s*user\s*(?=\S)(.{1,5}.{1,5}) thanks$

New

Dear user 1 2 thanks
Dear user 12345 6789 thanks
Dear user 123 5 6789 thanks
Dear user1 2 thanks
Dear user 1 thanks
Dear user 12345 67890 thanks

Dear user 1 2 thanks
Dear user 12345 6789 thanks
Dear user 123 5 6789 thanks
Dear user1 2 thanks
Dear user 1 thanks
Dear user 12345 67890 thanks