Regexp Modifiers / Options

/jsRegex Panels/i

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1. dotAll / s option
Word Wrap
dotAll option or /s makes dot (.) character match any character with newlines as well. Without this flag, the dot (.) character match any character but not the newlines such as \n. Check and uncheck the 's' option below to see the difference.
Enter input string
one two three four five
Enter regex pattern
i - Ignore Case
g - Global Match
m - Multiline
s - Dot All
u - Unicode
y - Sticky
With lastIndex^?
/./gsCount:26
one two three four five
match position
o 0
n 1
e 2
3
t 4
w 5
o 6
7
8
9
t 10
h 11
r 12
e 13
e 14
15
f 16
o 17
u 18
r 19
20
21
f 22
i 23
v 24
e 25
2. multiline / m option
Word Wrap
Multiline option makes ^ and $ anchors work in every line in a multiline string input. If this option is not used, the entire multiline input will be considered as a single line of text with embedded newline character. In such case, ^ and $ will be applied only once at the begin and end of the multiline text respectively.
Enter input string
The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown
Enter regex pattern
i - Ignore Case
g - Global Match
m - Multiline
s - Dot All
u - Unicode
y - Sticky
With lastIndex^?
/^(T|t)he|own$/gmCount:6
The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown
match position $1
The 0 T
own 12
the 31 t
the 76 t
own 102
own 147
3. ignoreCase / i option
Word Wrap
Enter input string
Enter regex pattern
i - Ignore Case
g - Global Match
m - Multiline
s - Dot All
u - Unicode
y - Sticky
With lastIndex^?
/s/igCount:4
Javascript Regular ExpreSSionS
match position
s 4
S 24
S 25
S 29

match	position
o	0
n	1
e	2
	3
t	4
w	5
o	6
	7
	8
	9
t	10
h	11
r	12
e	13
e	14
	15
f	16
o	17
u	18
r	19
	20
	21
f	22
i	23
v	24
e	25

match	position	$1
The	0	T
own	12
the	31	t
the	76	t
own	102
own	147

match	position
o	0
n	1
e	2
	3
t	4
w	5
o	6
	7
	8
	9
t	10
h	11
r	12
e	13
e	14
	15
f	16
o	17
u	18
r	19
	20
	21
f	22
i	23
v	24
e	25

match	position
o	0
n	1
e	2
	3
t	4
w	5
o	6
	7
	8
	9
t	10
h	11
r	12
e	13
e	14
	15
f	16
o	17
u	18
r	19
	20
	21
f	22
i	23
v	24
e	25