Regular
Expressions
101
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Explanation
/
^
[
1
-
9
]
[
2
-
9
]
(?!
00
$
)
[
0
-
9
]
[
1
-
9
]
?
\d
+
$
/
^
asserts position at start of the string
Match a single character present in the list below
[
1
-
9
]
1-9
a single character in the range between
1
(index 49)
and
9
(index 57)
(case sensitive)
Match a single character present in the list below
[
2
-
9
]
2-9
a single character in the range between
2
(index 50)
and
9
(index 57)
(case sensitive)
Negative Lookahead
(?!
00
$
)
Assert that the Regex below does not match
00
matches the characters
00
literally (case sensitive)
$
asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Line terminator(s) are \n
Match a single character present in the list below
[
0
-
9
]
0-9
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
[
1
-
9
]
?
?
Quantifier
— Matches between
zero
and
one
times, as many times as possible, giving back as needed
(greedy)
1-9
a single character in the range between
1
(index 49)
and
9
(index 57)
(case sensitive)
\d
+
matches a digit (equal to
[0-9]
)
+
Quantifier
— Matches between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
$
asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Line terminator(s) are \n
Match Information
Your regular expression does not match the subject string.
Try launching the debugger to find out why.
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Regular
Expressions
101
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