Regex chain replacement issue

Question

I try to develop a super basic template language, and I have a problem with RegEx, I try to convert this:

# Tilte
## Subtitle
### Subsubtitle
Lorem ipsum b(dolor) sit i(amet), consectetur u(adipisicing) elit

to this:

<h1>Title</h1>
<h2>Subtilte</h2>
<h3>Subsubtitle</h3>
Lorem ipsum <strong>dolor</strong> sit <i>amet</i>, consectetur <u>adipisicing</u> elit

But I get this:

<h1></h1>
<h2>TEma 4</h2>
<h3>Subtitle</h3>
Lorem ipsum <strong>Subsubtitle</strong> sit i(amet), consectetur u(adipisicing) elit

Here is my code:

input = ARGV[0]

regExes = {

    h1: [/^# (.*)$/, "<h1>", "</h1>"],
    h2: [/^## (.*)$/, "<h2>", "</h2>"],
    h3: [/^### (.*)$/, "<h3>", "</h3>"],
    b: [/b\((.*)\)/, "<strong>", "</strong>"],

}

strFile = File.read input

puts "\t", strFile

for index, regEx  in regExes

    actualNode = regExes[index]
    print actualNode, "\n"
    strFile.gsub! actualNode[0], "#{actualNode[1]}#{$1}#{actualNode[2]}"

end

puts strFile

What should I do?

Ok, one thing is solved, but I still have the problems with **the h group tags** — Daviz Castilla, May 10 '16 at 21:48

score 2 · Accepted Answer · answered May 10 '16 at 22:55

You need to define the regexes in this order (and mind the lazy matching with strong, underline and bold tags and the word boundary \b in front of each of those to make sure we do not match parts of words):

regExes = {

    h3: [/^### (.*)$/, "<h3>", "</h3>"],
    h2: [/^## (.*)$/, "<h2>", "</h2>"],
    h1: [/^# (.*)$/, "<h1>", "</h1>"],
    b: [/\bb\((.*?)\)/, "<strong>", "</strong>"],
    i: [/\bi\((.*?)\)/, "<i>", "</i>"],
    u: [/\bu\((.*?)\)/, "<u>", "</u>"],
}

and then use a non-destructive gsub:

input = input.gsub(actualNode[0], "#{actualNode[1]}\\1#{actualNode[2]}")

See this IDEONE demo

score 1 · Answer 2 · answered May 10 '16 at 22:00

1

Instead of the gsub! line try this...

strfile = actualNode[1]+actualNode[0].match(strfile)[1]+actualNode[2] if actualNode[0].match(strfile)

answered May 10 '16 at 22:00

SteveTurczyn

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You included the part where I wrote `+actualNode[2]`? You scrolled to see the whole line? – SteveTurczyn May 10 '16 at 22:25
I tested this in irb. – SteveTurczyn May 10 '16 at 22:26

Regex chain replacement issue

2 Answers2