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Some String Handling
Strings and Regular Expressions example from a Well House Consultants training course
More on Strings and Regular Expressions [link]
Source code: bc Module: R109
# This example shows many of the string definition # and handling options available to you in Ruby # A "here" document - a block of text about = <<'HEADER_END' A Christmas tree has been dragged from Finland to celebrate the birth of a child in Israel and we are in England HEADER_END # Single quoted strings (and %q) are literals # Double quoted strings (and %Q) are operators # Back quoted strings (and %x) are OS commands puts 'Hello World\n' puts "Hello World\n" puts %q!Hello 'World'\n! puts %q(Hello 'World'\n) puts %Q(Hello 'World'\n) puts `uptime` puts %x!df -k! freespace = %x!df -k! print about # Split the df report line by line lynes = freespace.split("\n") p lynes # remove the last and first lines cd = lynes.pop lynes.shift # add a new line on the end lynes.push("That's all folks") # List out all the lines that are left lynes.each do |here| puts here end __END__ This is how it runs 92:d2 grahamellis$ ruby bc Hello World\n Hello World Hello 'World'\n Hello 'World'\n Hello 'World' 19:51 up 1:49, 2 users, load averages: 1.62 0.86 0.66 Filesystem 1024-blocks Used Available Capacity Mounted on /dev/disk0s3 117089712 108064516 8769196 93% / devfs 119 119 0 100% /dev fdesc 1 1 0 100% /dev map -hosts 0 0 0 100% /net map auto_home 0 0 0 100% /home /dev/disk1 595064 595064 0 100% /Volumes/The No. 1 Summer Dance Hits Album [Disc 2] A Christmas tree has been dragged from Finland to celebrate the birth of a child in Israel and we are in England ["Filesystem 1024-blocks Used Available Capacity Mounted on", "/dev/disk0s3 117089712 108064516 8769196 93% /", "devfs 119 119 0 100% /dev", "fdesc 1 1 0 100% /dev", "map -hosts 0 0 0 100% /net", "map auto_home 0 0 0 100% /home", "/dev/disk1 595064 595064 0 100% /Volumes/The No. 1 Summer Dance Hits Album [Disc 2]"] /dev/disk0s3 117089712 108064516 8769196 93% / devfs 119 119 0 100% /dev fdesc 1 1 0 100% /dev map -hosts 0 0 0 100% /net map auto_home 0 0 0 100% /home That's all folks 92:d2 grahamellis$ Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Ruby * Ruby Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Strings and Regular Expressions" training module. You'll find a description of the topic and some
other closely related examples on the "Strings and Regular Expressions" module index page.
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