Regular
Expressions
101
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Explanation
`
^
Exactfoobar
(?:
\.
[
a
-
z0
-
9
]
[
a
-
z0
-
9_-
]
*
){2}(?:
\.
[
a
-
zA
-
Z0
-
9
]
[
a
-
zA
-
Z0
-
9_-
]
*
)+
$
`
gm
^
asserts position at start of a line
Exactfoobar
matches the characters
Exactfoobar
literally (case sensitive)
Non-capturing group
(?:
\.
[
a
-
z0
-
9
]
[
a
-
z0
-
9_-
]
*
){2}
{2}
matches the previous token exactly
2
times
\.
matches the character
.
with index
46
10
(
2E
16
or
56
8
) literally (case sensitive)
Match a single character present in the list below
[
a
-
z0
-
9
]
a-z
matches a single character in the range between
a
(index 97)
and
z
(index 122)
(case sensitive)
0-9
matches a single character in the range between
0
(index 48)
and
9
(index 57)
(case sensitive)
Match a single character present in the list below
[
a
-
z0
-
9_-
]
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
a-z
matches a single character in the range between
a
(index 97)
and
z
(index 122)
(case sensitive)
0-9
matches a single character in the range between
0
(index 48)
and
9
(index 57)
(case sensitive)
_-
matches a single character in the list
_-
(case sensitive)
Non-capturing group
(?:
\.
[
a
-
zA
-
Z0
-
9
]
[
a
-
zA
-
Z0
-
9_-
]
*
)+
+
matches the previous token between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
\.
matches the character
.
with index
46
10
(
2E
16
or
56
8
) literally (case sensitive)
Match a single character present in the list below
[
a
-
zA
-
Z0
-
9
]
a-z
matches a single character in the range between
a
(index 97)
and
z
(index 122)
(case sensitive)
A-Z
matches a single character in the range between
A
(index 65)
and
Z
(index 90)
(case sensitive)
0-9
matches a single character in the range between
0
(index 48)
and
9
(index 57)
(case sensitive)
Match a single character present in the list below
[
a
-
zA
-
Z0
-
9_-
]
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
a-z
matches a single character in the range between
a
(index 97)
and
z
(index 122)
(case sensitive)
A-Z
matches a single character in the range between
A
(index 65)
and
Z
(index 90)
(case sensitive)
0-9
matches a single character in the range between
0
(index 48)
and
9
(index 57)
(case sensitive)
_-
matches a single character in the list
_-
(case sensitive)
$
asserts position at the end of a line
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
Regular Expression
v3
No Match
`
`
gm
Test String
Code Generator
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Generated Code
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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for Rust, please visit:
https://docs.rs/regex/latest/regex/
Regular
Expressions
101
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