What does \d do in this example?
/Chapter (\d+)\.\d*/
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2Different things depending on where you put it.Quentin– Quentin2010-12-27 19:14:32 +00:00Commented Dec 27, 2010 at 19:14
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3 Answers
In what context?
In a regular expression, it matches a digit (0-9).
Edit, according to your comment:
It matches any string starting with Chapter, followed by digits, then a dot, then a number of digits. Like Chapter 1.0 and Chapter 12.01.
5 Comments
DarkLightA
/Chapter (\d+)\.\d*/ <- how is it used?
alexn
It matches any string starting with Chapter, followed by digits, then a dot, then a number of digits. Like
Chapter 1.0 and Chapter 12.01. You should update your original question with that one.
Mark Baijens
That is a regular expression. It helps matching patterns. Google has plenty of information about it.
alexn
It's for grouping. You can access a group by \1 for the first group, \2 for the second and so on. More info here daaq.net/old/javascript/…
Chuck
It would also match "Chapter 1.", without anything after the dot. Anyway, it looks like the purpose is actually to detect the main chapter number, right before the dot, which is what the parens do.
In a regex it means digits 0-9
\d Digits 0 through 9 /H\d/ matches "H3"
Comments
If it is in a regular expression (match or replace or split) or a /.../ string then it probably means match any digit 0-9. Please provide the code you see it in so we can be sure.
2 Comments
DarkLightA
/Chapter (\d+)\.\d*/ <- how is it used?
700 Software
That is a regular expression to match the word
Chapter followed by space, then one or more digits (\d+) (these first digits are captured to $1 I don't know if you are using $1 or ignoring it). After that it matches a dot \., then it is allowed but not required to have digits after the dot \d*