split a string using regular expression in perl

Question

I have a string which is of this form:

$str = "30M1I20M150N20M190N50M"

EDITED: I would like to split this string so that my ouput looks like this:

30M1I20M
150N
20M
190N
50M

However, when I tried with,

@split_str = split(/(\d+)N/, $str);

I get:

30M1I20M
150
20M
190
50M

As you can see, the N gets omitted in the result (150, 190 instead of 150N and 190N). Could anyone tell me how I should go about? Thank you!

Your example does not make sense: if you split on N keeping the N you get: 30M1I20M150N, 20M190N and 50M. Did I get something wrong? — Matteo
– Matteo, Commented Nov 27, 2011 at 14:14
You can as suggested in the answers put the N in the capture group or just reattach it to the strings — Matteo
– Matteo, Commented Nov 27, 2011 at 14:20

Quentin · Accepted Answer · 2011-11-27 14:15:24Z

7

Put the N inside the capture group.

/(\d+N)/

answered Nov 27, 2011 at 14:15

Quentin

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Comments

daxim · Accepted Answer · 2011-11-27 14:19:16Z

1

See Look-around assertions in perlre.

split /(?<=[NM])/, '30M1I20M150N20M190N50M'
# returns
# qw(
#     30M
#     1I20M
#     150N
#     20M
#     190N
#     50M
# )

answered Nov 27, 2011 at 14:19

daxim

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2 Comments

snoofkin Over a year ago

I believe the '?<=' is a look ahead insertion? I never really understood those, what exactly it does? thanks

daxim Over a year ago

See Look-around assertions in perlre. But I'm repeating myself.

snoofkin · Accepted Answer · 2011-11-27 14:21:45Z

1

try the following (not tested):

split(/(\d+?[MN])/, $str);

edited Nov 27, 2011 at 14:21

answered Nov 27, 2011 at 14:15

snoofkin

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1 Comment

snoofkin Over a year ago

Since I guess you are trying to get also 'M's

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