Regular
Expressions
101
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Explanation
/
^
(
[
A
-
z
]
)(?:
=
)(
\d
|
[
A
-
z
]
)
$
/
gm
^
asserts position at start of a line
Lines are delimited by \n
1st Capturing Group
(
[
A
-
z
]
)
Match a single character present in the list below
[
A
-
z
]
+
matches the previous token between
one
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 65)
and
z
(index 122)
(case sensitive)
Non-capturing group
(?:
=
)
matches the character
literally (case sensitive)
*
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)
matches the character
literally (case sensitive)
*
matches the previous token between
zero
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
2nd Capturing Group
(
\d
|
[
A
-
z
]
)
1st Alternative
\d
\d
matches a digit (equivalent to
[0-9]
)
+
matches the previous token between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
2nd Alternative
[
A
-
z
]
Match a single character present in the list below
[
A
-
z
]
+
matches the previous token between
one
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 65)
and
z
(index 122)
(case sensitive)
$
asserts position at the end of a line
Lines are delimited by \n
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.
Try launching the debugger to find out why.
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