Regex .net multiple line

Question

I have these examples:

{I18n.get("Testing 123...")}

{I18n.get('Testing 123...')}

    {I18n.get(
            "Testing 123..."
     )}
    
    {I18n.get("Testing 123..."
     )}
    
    {I18n.get(
            "Testing 123...")}

I want to extract the 'Testing 123...' in .Net using C# Regex. What I did was:

        Regex r = new Regex(@"(?:I18n.get\(""(.+?)""\))", RegexOptions.IgnoreCase | RegexOptions.Singleline);

        var matches = r.Matches(txt)
                        .Select(xx=> xx.Groups)
                        .Select(xx=> xx.Last().Value)
                        .ToList();

When is single line works perfect, but when is multiple line it fails...

And how would be possible to match in a single Regex when the txt is with double quotes " or when is with single quotes ' ?

You need to match whitespace, @"I18n\.get\(\s*""(.+?)""\)". Also, you do not need two Select, just use r.Matches(txt).Cast<Match>().Select(x=>x.Groups[1].Value).ToList() — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jul 31, 2020 at 19:50
This way it grabs more than have to.. looks like is not finding the end )... — 2Fast4YouBR
– 2Fast4YouBR, Commented Jul 31, 2020 at 19:58
Ok, add \s* on the right, @"I18n\.get\(\s*""(.*?)""\s*\)", see demo. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jul 31, 2020 at 20:00
Perfect! did a .Net exemple but you answered first dotnetfiddle.net/glGGvF . How about capture when its in Double Quotes and when is in Single Quotes.. would be possible in one regex? Make an answer so I can accept. cheers — 2Fast4YouBR
– 2Fast4YouBR, Commented Jul 31, 2020 at 20:09

Wiktor Stribiżew · Accepted Answer · 2020-07-31 20:20:11Z

1

You may use

var r = new Regex(@"I18n\.get\(\s*(""|')(.*?)\1\s*\)", RegexOptions.IgnoreCase | RegexOptions.Singleline);
var results = r.Matches(txt).Cast<Match>().Select(x => x.Groups[2].Value).ToList();

See the regex demo.

Details

I18n\.get\( - a literal I18n.get( text
\s* - 0+ whitespaces
("|') - Group 1: " or '
(.*?) - Group 2: any char, 0 or more occurrences, as few as possible
\1 - same value as captured in Group 1
\s* - 0+ whitespaces
\) - a ) char.

answered Jul 31, 2020 at 20:20

Wiktor Stribiżew

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2 Comments

2Fast4YouBR Over a year ago

Not working Wiktor... dotnetfiddle.net/2WAFVX

Wiktor Stribiżew Over a year ago

@2Fast4YouBR Because you are not using my code. The value you need is in Group 2: Console.WriteLine(m.Groups[2].Value);

user13843220 · Accepted Answer · 2020-07-31 22:59:51Z

0

I contend it doesn't matter which open/close quotes should be in the regex when you don't intend to actually parse it as a quoted string, right ?
I mean with all the embed escapes etc...

Use what you know as the delimiters, the text literals
I18n.get( stuff here )

You could use a sub validation that there's an inner quote, but since you're
not parsing quotes, it's not going to be strictly valid anyway.
Here, we just use it to trim so it's not matched and be part of element.

Here it is, the whole match is the value you're looking for, toss it into an array.

@"(?s)(?<=I18n\s*\.\s*get\s*\(\s*['""]\s*).*?(?=\s*['""]\s*\))"

answered Jul 31, 2020 at 22:59

user13843220

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