Regular Expression Tutorial

Practice

pattern attribute	Type your text	Check
a
abc
1
123
\d
\D
.
\.
[abc]
[^abc]
[a-z]
[a-zA-Z]
[0-9]
[a-zA-Z0-9]
\w
\W
\d{3}
\w{3}
\d{3,5}
\d{3,}
o*
o+
o?
do*g
do+g
do?g
\s
\S
\s+
\S+
^d
g$
^d.*g$
(dog|cat)

Excercises

pattern attribute	Target String	Check
확인 해답보기 \d{2,3}-?\d{3,4}-?\d{4}
확인 해답보기 \w+\.?\w+\+?\w+@\w+\.?\w+\.?\w+

Lesson Note

Pattern	Description
abc…	Letters
123…	Digits
\d	Any Digit
\D	Any Non-digit character
.	Any Character
\.	Dot
[abc]	Only a, b, or c
[^abc]	Not a, b, nor c
[a-z]	Characters a to z
[a-zA-Z]	Characters a to z or A to Z
[0-9]	Numbers 0 to 9
[a-zA-Z0-9]	Characters a to z or A to Z or 0 to 9
\w	Any Alphanumeric character
\W	Any Non-alphanumeric character
{m}	m Repetitions
{m,n}	m to n Repetitions
{m,}	m or more Repetitions
*	Zero or more repetitions
+	One or more repetitions
?	Optional character
\s	Any Whitespace
\S	Any Non-whitespace character
^…$	Starts and ends
(…)	Capture Group
(a(bc))	Capture Sub-group
(.*)	Capture all
(abc|def)	Matches abc or def