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Regex Expression in VBA

Posted on 2015-01-11
Medium Priority
Last Modified: 2015-01-11

To verify my understanding, the submatch is
1. (http://)?
2. ([\w-]+\.)
3. ([\w-]+\.)?
4. ([\w-]+)
5. ([:/].*)?

The division of "?" is following the matching expression in each portion, correct ?

For the 5th submatch : ([:/].*)?, "?" mean zero or more for the expression within (). but what does ".*" mean ? Tks

Question by:AXISHK
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LVL 85

Expert Comment

ID: 40543621
The ? in (http://)? makes the match of http:// optional
The ? in ([\w-]+\.)? makes the match of [\w-]+\. optional
The ? in ([:/].*)? makes the match of [:/].* optional
LVL 23

Assisted Solution

by:Michael Fowler
Michael Fowler earned 1000 total points
ID: 40543622
The question mark tells the regex to match 0 or 1 of the preceding pattern


(http://)?  allows for the pattern "http://" to be present or missing

Author Comment

ID: 40543623

([:/].*)?  -

For ".*" ,  what does it actually mean ?
.            Matches any single character except a new line character
*            Matches preceding element zero or more times
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LVL 23

Expert Comment

by:Michael Fowler
ID: 40543626
This matches any string which does not contain a new line. As it is zero or more times it will also match empty strings
LVL 85

Accepted Solution

ozo earned 1000 total points
ID: 40543627
.* matches any number of non-new line characters

Author Closing Comment

ID: 40543633

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