Ruby Inserting "\n" newline into String with Regular Expression

Question

I have a variable like so:

output = "KORD 142327Z 1500/1606 31012KT P6SM FEW060 SCT300 FM150200 04007KT >P6SM FEW300 FM150400 01005KT P6SM SKC FM151400 22008KT P6SM SCT250 FM151900 >22014G23KT P6SM BKN250 FM160200 23014KT P6SM SCT150 BKN250 WS010/25040"

I want to insert a newline before every "FM" character sequence so I can print it to user and its easier to read.

Currently my code is as follows, but replaces the first "FM" sequence with a "\n" then stops without continuing onto the next "FM" set.

output [/(FM{1})/, 0] = "\n"

I don't want to replace FM with newline. I need to append "\n" immediately before each "FM" character set. Any help with this would be appreciated.

Papaya Labs · Accepted Answer · 2015-03-15 02:16:11Z

1

Try this:

 output.gsub!("FM","\nFM")

answered Mar 15, 2015 at 2:16

Papaya Labs

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4 Comments

djvs Over a year ago

Make that output.gsub!("FM","\nFM")

Michael Over a year ago

that would replace FM with a new line. I don't want to replace FM. Just put a new line before every occurrence of FM

Cary Swoveland Over a year ago

If "FM" is only to be converted to "\nFM" when "F" is immediately preceded by a word boundary, change "FM" to /\bFM/. That will prevent, say, "'IFM'" from being converted to "I\nFM".

Michael Over a year ago

Thanks Cary. When you say word Boundary, do you mean a character? Having characters prior to "F" is not my situation, but I will keep this in mind if a similar situation comes up.

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