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
Language
AutoIt
C#
Golang
Java
JavaScript
Perl
PHP
Python
Ruby
Rust
SED
Swift 5.2
Generated Code
Loading code sample...
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 C#, please visit:
https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx
Regular
Expressions
101
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