Regular Expressions 101

^start of line

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

Group 1( ?\d){5}

{5}repeats the group contents below exactly 5 times:

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\da digit

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

$end of line

Positive Lookahead(?=\d* ?\d*$)

\d*a digit, repeated any number of times

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

\d*a digit, repeated any number of times

$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.

Search reference

Regular Expression

^(?=( ?\d){5} *$)(?=\d* ?\d*$)

New

73648
3 0324
 98734
98234 

324234
324 343
33  345

f7364ffff8f