Regular expressions

ruby-talk
1

I’m having trouble with a simple match:

line
=> “”
line =~ /(<img .*>)/
=> nil

Shouldn’t “.” match anything other than “\n”?
Can anyone see what I’m doing wrong?

···

–
Daniel Carrera
Graduate Teaching Assistant. Math Dept.
University of Maryland. (301) 405-5137

2

I’m having trouble with a simple match:

line
=> “”
line =~ /(<img .*>)/
=> nil

Shouldn’t “.” match anything other than “\n”?
Can anyone see what I’m doing wrong?

But you have ., which matches a literal period.

···

At 5:38 +0900 1/22/03, Daniel Carrera wrote:

–
Daniel Carrera
Graduate Teaching Assistant. Math Dept.
University of Maryland. (301) 405-5137

3

In addition to the . as mentioned early, .* is greedy, so if
you have:

then /(<img .*>)/ will give $1 = ‘’

You want either /(<img [^>]>)/ or /(<img .?>)/, the latter being
non-greedy.

···

Daniel Carrera (dcarrera@math.umd.edu) wrote:

I’m having trouble with a simple match:

line
=> “”
line =~ /(<img .*>)/
=> nil

Shouldn’t “.” match anything other than “\n”?
Can anyone see what I’m doing wrong?

–
Eric Hodel - drbrain@segment7.net - http://segment7.net
All messages signed with fingerprint:
FEC2 57F1 D465 EB15 5D6E 7C11 332A 551C 796C 9F04

4

Hi –

···

On Wed, 22 Jan 2003, Daniel Carrera wrote:

I’m having trouble with a simple match:

line
=> “”
line =~ /(<img .*>)/
=> nil

Shouldn’t “.” match anything other than “\n”?
Can anyone see what I’m doing wrong?

You’ve escaped your . so it’s a literal . , which then
isn’t found. You have to remove the ''.

David

–
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web: http://pirate.shu.edu/~blackdav

5

Okay, now I feel stupid. Thanks.

···

On Wed, Jan 22, 2003 at 05:42:07AM +0900, Paul DuBois wrote:

But you have ., which matches a literal period.

–
Daniel Carrera
Graduate Teaching Assistant. Math Dept.
University of Maryland. (301) 405-5137