Regular
Expressions
101
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Explanation
/
\b
payments
\W
+
(?:
\w
+
\W
+
){1,9}?(?<highlight>
\d
{1,3}
)
\s
+?
days
\b
/
gm
\b
assert position at a word boundary:
(^
\w|\w
$|\W
\w|\w
\W)
payments
matches the characters
payments
literally (case sensitive)
\W
matches any non-word character (equivalent to
[^a-zA-Z0-9_]
)
+
matches the previous token between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
Non-capturing group
(?:
\w
+
\W
+
){1,9}?
{1,9}?
matches the previous token between
1
and
9
times, as few times as possible, expanding as needed
(lazy)
\w
matches any word character (equivalent to
[a-zA-Z0-9_]
)
+
matches the previous token between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
\W
matches any non-word character (equivalent to
[^a-zA-Z0-9_]
)
+
matches the previous token between
one
and
unlimited
times, as many times as possible, giving back as needed
(greedy)
Named Capture Group
highlight
(?<highlight>
\d
{1,3}
)
\d
matches a digit (equivalent to
[0-9]
)
{1,3}
matches the previous token between
1
and
3
times, as many times as possible, giving back as needed
(greedy)
\s
matches any whitespace character (equivalent to
[\r\n\t\f\v
]
)
+?
matches the previous token between
one
and
unlimited
times, as few times as possible, expanding as needed
(lazy)
days
matches the characters
days
literally (case sensitive)
\b
assert position at a word boundary:
(^
\w|\w
$|\W
\w|\w
\W)
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.
Quick Reference
Regular Expression
v1
No Match
/
/
gm
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Generated Code
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For a full regex reference for JavaScript, please visit:
https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions
Regular
Expressions
101
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