Regular
Expressions
101
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Explanation
/
^\s
*
(?:
(?:
kind
(?:
est
)*
)*
regards
?
|
cheers
?
|
greetings
?
|
thanks
|
thank
you
)
\b
,
?
.
*
[
\r\n
]
{0,2}
.
*
(?:
[
.!?:
]
*
|
$
)
/
gim
^
asserts position at start of a line
\s
matches any whitespace character (equivalent to
[\r\n\t\f\v
\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]
)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
Non-capturing group
(?:
(?:
kind
(?:
est
)*
)*
regards
?
|
cheers
?
|
greetings
?
|
thanks
|
thank
you
)
1st Alternative
(?:
kind
(?:
est
)*
)*
regards
?
Non-capturing group
(?:
kind
(?:
est
)*
)*
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
kind
matches the characters
kind
literally (case insensitive)
Non-capturing group
(?:
est
)*
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
est
matches the characters
est
literally (case insensitive)
matches the character
with index
32
10
(
20
16
or
40
8
) literally (case insensitive)
regard
matches the characters
regard
literally (case insensitive)
s
matches the character
s
with index
115
10
(
73
16
or
163
8
) literally (case insensitive)
2nd Alternative
cheers
?
cheer
matches the characters
cheer
literally (case insensitive)
s
matches the character
s
with index
115
10
(
73
16
or
163
8
) literally (case insensitive)
3rd Alternative
greetings
?
greeting
matches the characters
greeting
literally (case insensitive)
s
matches the character
s
with index
115
10
(
73
16
or
163
8
) literally (case insensitive)
4th Alternative
thanks
thanks
matches the characters
thanks
literally (case insensitive)
5th Alternative
thank
you
thank
you
matches the characters
thank
you
literally (case insensitive)
\b
assert position at a word boundary:
(^
\w|\w
$|\W
\w|\w
\W)
,
matches the character
,
with index
44
10
(
2C
16
or
54
8
) literally (case insensitive)
.
matches any character (except for line terminators)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
Match a single character present in the list below
[
\r\n
]
{0,2}
matches the previous token between
0
and
2
times, as many times as possible, giving back as needed
(greedy)
\r
matches a carriage return
(ASCII 13)
\n
matches a line-feed (newline) character
(ASCII 10)
.
matches any character (except for line terminators)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
Non-capturing group
(?:
[
.!?:
]
*
|
$
)
1st Alternative
[
.!?:
]
*
Match a single character present in the list below
[
.!?:
]
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
.!?:
matches a single character in the list
.!?:
(case insensitive)
2nd Alternative
$
$
asserts position at the end of a line
Global pattern flags
g modifier:
g
lobal. All matches (don't return after first match)
i modifier:
i
nsensitive. Case insensitive match (ignores case of
[a-zA-Z]
)
m modifier:
m
ulti line. Causes
^
and
$
to match the begin/end of each line (not only begin/end of string)
Match Information
Your regular expression does not match the subject string.
Quick Reference
Regular Expression
v4
No Match
/
/
gim
Test String
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Generated Code
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For a full regex reference for Perl, please visit:
http://perldoc.perl.org/perlre.html
Regular
Expressions
101
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