Regular Expressions 101

Pro

^start of line

Character Class[A-Za-z0-9]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 1([?][A-Za-z0-9]*)+

+repeats the group contents below at least once:

Character Class[?]

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Character Class[A-Za-z0-9]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$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.

25 tokens

^[A-Za-z0-9]*([?][A-Za-z0-9]*)+$

New

Match
--------
ABC123?A
1ABCA?
?2ABCD
?
abc?d?

but not
------
ABC123
ABC.?1D1
ABC(a)?1d

Match
--------
ABC123?A
1ABCA?
?2ABCD
?
abc?d?

but not
------
ABC123
ABC.?1D1
ABC(a)?1d