perl - using regex to get substring

Question

I do realize that there are a lot of perl regex questions here on SO; I haven't been able to find one that helps me in my situation. I have the following string:

string = "dn: example\nl: example\ndepartment: example\nname: example"

I am trying to extract each field (except dn) using the following:

my ($name) = $output_string =~ /name:\s(\w+)\n/;
my ($department) = $output_string =~ /department:\s(\w+)\n/;
my ($location) = $output_string =~ /location:\s(\w+)\n/;

I must not be understanding how to use regex, because that isn't working for me. Each variable is ending up undefined. What am I doing wrong?

pobrelkey · Accepted Answer · 2013-11-20 17:56:26Z

2

Add the m flag to switch on multi-line mode, then use start-of-line and end-of-line anchors to match the start/end of the lines in your string:

my ($name)       = $output_string =~ /^name:\s(\w+)$/m;
my ($department) = $output_string =~ /^department:\s(\w+)$/m;
my ($location)   = $output_string =~ /^location:\s(\w+)$/m;

answered Nov 20, 2013 at 17:56

pobrelkey

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ysth · Accepted Answer · 2013-11-20 18:23:12Z

1

The problem here is your input; you are expecting a \n after name: but there isn't one there, and you are looking for location: but have l: in your input.

Using the /m flag and $ instead of \n will fix the first problem, because $ will match at either the end of a line or the end of the input.

answered Nov 20, 2013 at 18:23

ysth

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