Regexp pattern - gsub ruby [closed] - ruby

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I'm trying to make a gsub that when I make an input like this:
'09/02 10:00 hs any string'
Will give me back something like:
'09/02 10:00'
So my gsub should take out all the strings that are non-numbers but I need ':' and '/' to stay
Help please.

Takes out all the strings that are non-numbers but I need ':' and '/' to stay
"09/02 10:00 hs any string".gsub(/[^0-9\/:]/, '')
# "09/0210:00"

Try this:
result = '09/02 10:00 hs any string'.gsub(/(?<=^\d{2}\/\d{2} \d{2}:\d{2}).*/, '')
the idea is to not capture the date time putting it in a lookbehind.

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Need to fetch the password using Regular expression [closed]

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a= <<EOF
Password
:
7UV1ceFQ (You will be asked to change this after logging in for the first time)
EOF
I need to extract the value "7UV1ceFQ" using regular expression, I have tried using '/Password : 7UV1ceFQ/ but it's not working, I think it's because next line character is included, Can anyone please suggest me to exact this value?
▶ a[/^\S+(?=\s\(You will be)/]
#⇒ "7UV1ceFQ"
The regular expression above reads as:
starting with a new line start ^
get all non-space symbols greedy \S+
until the positive lookahead (?=\s\(You will be)

Regular expression in ruby 2.1.5 [closed]

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I want to extract alpha-beta from:
text = "alpha-beta-1.0.txt"
to get:
output = "alpha-beta"
Can somebody here help me with a regex?
If you have a computer programming problem, and you think, "I'll use a
regex!", now you have two problems.
Here it is without a regex:
strings = [
"alpha-beta-1.0.txt",
"alpha-beta-theta-2.0.txt",
"alpha-3.0.text",
]
strings.each do |string|
output = string.rpartition('-')[0]
puts output
end
--output:--
alpha-beta
alpha-beta-theta
alpha
If you want to extract just before last -, you can use this regex
(^.*)-(?:.*$)
Rubular Demo
For finding all non-overlapping matches, you can use scan as
str = "alpha-beta-1.0.txt"
print str.scan(/(^.*)-(?:.*$)/)[0][0]
Ideone Demo
You can also use lookahead as
.*(?=-)
With the information we have i'd propose:
output = "alpha-beta-1.0.txt".match(/(.*-.*)-.*/)[1]
.* matches a lot though. So perhaps you need a more restrictive match.

Multiple action on string in ruby in one go [closed]

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Here is a string a content is "hi all I'm new here(seriously)"
How can I return a "hi+all+I'm+new+here" using ruby code?
Why not simply chain the .gsub() commands?
x.gsub(/\(.*?\)/, '').gsub(/\s+/,'+')
Also, you can update your first gsub to delete any whitespace preceding the brackets aswell.
x.gsub(/\s+\(.*?\)/, '')
If you really want to use a single gsub operation, you can pass a hash as the replacement parameter:
x.gsub(/( *\(.*?\)| )/, ' ' => '+', default: '')
# => "hi+all"
What this does is captures either something in brackets (including the leading spaces) or spaces. If the capture is a space - it is replaced by '+', otherwise, it replaces to empty string ''

Regex issue with a string and all numbers [closed]

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In Ruby, I would like to create a regular expression that matches the following:
building/liberty-green/6d
(the word building and some number somewhere after it)
Currently, I have /building/ and need to add \d (any digit) to it, but I don't know how.
You need /building\/[\w-]+\/\w+/. For example:
irb(main):001:0> /building\/[\w-]+\/\w+/.match("building/liberty-green/6d")
=> #<MatchData "building/liberty-green/6d">
That expression will match any string that:
Starts with /building/
Then follows with one or more word characters or dashes (eg. foo-bar, foo, bar-1)
Then follows with a /
Finally ends with one or more word characters (eg. foo, 6d, 12345)
Note that \w includes digits.

Convert string using Ruby [closed]

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How can I convert the string russ(ai)(edocn)cup to russiancodecup using Ruby?
By using gsub with a block, you can replace any match of a regular expression by the result of this block.
s = "russ(ai)(edocn)cup"
s.gsub(/\(([^)]*)\)/) {$1.reverse} # => "russiancodecup"
Here the regular expression will match any non-) character between brackets. Then it will send reverse to $1 which is gonna be the content between brackets.
$0 will be the complete match and $n, the nth "submatch". (anybody for the correct word ?)

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