Regular
Expressions
101
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Explanation
/
^
(
0
|
[
1
-
9
]
\d
)
\.
(
0
|
[
1
-
9
]
\d
)
\.
(
0
|
[
1
-
9
]
\d
)(?:
-
(
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)(?:
\.
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)
)*
)
)?(?:
\+
(
[
0
-
9a
-
zA
-
Z-
]
(?:
\.
[
0
-
9a
-
zA
-
Z-
]
)*
)
)?
$
/
gm
^
asserts position at start of a line
Lines are delimited by \n, \r, \u2028, \u2029 (with no special consideration for the \r\n sequence)
1st Capturing Group
(
0
|
[
1
-
9
]
\d
)
1st Alternative
0
0
matches the character
0
literally (case sensitive)
2nd Alternative
[
1
-
9
]
\d
Match a single character present in the list below
[
1
-
9
]
1-9
matches a single character in the range between
1
(index 49)
and
9
(index 57)
(case sensitive)
\d
matches a digit (equivalent to
[0-9]
)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
\.
matches the character
.
literally (case sensitive)
2nd Capturing Group
(
0
|
[
1
-
9
]
\d
)
1st Alternative
0
0
matches the character
0
literally (case sensitive)
2nd Alternative
[
1
-
9
]
\d
Match a single character present in the list below
[
1
-
9
]
1-9
matches a single character in the range between
1
(index 49)
and
9
(index 57)
(case sensitive)
\d
matches a digit (equivalent to
[0-9]
)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
\.
matches the character
.
literally (case sensitive)
3rd Capturing Group
(
0
|
[
1
-
9
]
\d
)
1st Alternative
0
0
matches the character
0
literally (case sensitive)
2nd Alternative
[
1
-
9
]
\d
Match a single character present in the list below
[
1
-
9
]
1-9
matches a single character in the range between
1
(index 49)
and
9
(index 57)
(case sensitive)
\d
matches a digit (equivalent to
[0-9]
)
Non-capturing group
(?:
-
(
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)(?:
\.
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)
)*
)
)?
?
matches the previous token between
zero
and
one
times, as many times as possible, giving back as needed
(greedy)
-
matches the character
-
literally (case sensitive)
4th Capturing Group
(
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)(?:
\.
(?:
0
|
[
1
-
9
]
\d
|
\d
[
a
-
zA
-
Z-
]
[
0
-
9a
-
zA
-
Z-
]
)
)*
)
Non-capturing group
(?:
\+
(
[
0
-
9a
-
zA
-
Z-
]
(?:
\.
[
0
-
9a
-
zA
-
Z-
]
)*
)
)?
?
matches the previous token between
zero
and
one
times, as many times as possible, giving back as needed
(greedy)
\+
matches the character
+
literally (case sensitive)
5th Capturing Group
(
[
0
-
9a
-
zA
-
Z-
]
(?:
\.
[
0
-
9a
-
zA
-
Z-
]
)*
)
$
asserts position at the end of a line
Lines are delimited by \n, \r, \u2028, \u2029 (with no special consideration for the \r\n sequence)
Global pattern flags
g modifier:
g
lobal. All matches (don't return after first match)
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
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Regular
Expressions
101
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