Match only if conditions are true

Question

I'd like to get help with making a Regex match in JavaScript

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Match the number only:

• If the row (Odd) has a number larger than 25 AND the row after (Even) has the word " Apples " in it.
  • Explanation :
    • The first row's value (29) belongs to the second row ("First | Cocoa Apples are")
    • The third row's value (23) to the fourth row ("Second | Test Text") ... and so on...

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The TEXT I will be using it with:

29% OK
First | Cocoa Apples are
23% NOT
Second | Test Text
18% NOT
Third | Mango Alpa Tango
16% NOT
Fourth | Apples are
33% OK
Fifth | Text Testing App
10% NOT
Sixth | Apples are Gold Duck
28% OK
Seventh | Alpa Apples are Tango
66% OK
Eighth | Oh My Apples are Avocado
20% NOT
Ninth | This Is My Text
25% NOT
Tenth | This Is Hard

Answer 1

尝试这个：

/(2[5-9]|[3-9][0-9])%(?=.*\n.*Apples)/g

Answer 2

Not sure about a regex, but I think the following does a pretty good job with finding the numbers and lines:

 var str = `29% OK First | Cocoa Apples are 23% NOT Second | Test Text 18% NOT Third | Mango Alpa Tango 16% NOT Fourth | Apples are 33% OK Fifth | Text Testing App 10% NOT Sixth | Apples are Gold Duck 28% OK Seventh | Alpa Apples are Tango 66% OK Eighth | Oh My Apples are Avocado 20% NOT Ninth | This Is My Text 25% NOT Tenth | This Is Hard`; var bigger = false; str.split("\\n").forEach(function(row, i) { if (i % 2 == 0 && parseInt(row.replace(/\\\\D/g, ""), 10) >= 25) { bigger = true; } else { if (bigger) { bigger = false; if (row.indexOf("Apples") > -1) { console.log("match in line " + i ); } } } }); 

Answer 3

Here, it should work as your request

^(?:(?:.*\n){2})*?((?:2[6-9]|[3-9][0-9]|100)).*\n.*Apples

Explanations

^(?:(?:.*\\n){2})*? match zero line or even number of lines,

((?:2[6-9]|[3-9][0-9]|100)) group number of percentage which larger than 25 to variable \\1 ,

.*\\n.*Apples match line that has the word "Apples" .

see, DEMO

Note that because of some limitation of lookbehind in javascript, it's much more convenience to capture number of percentage than just match it.

Some more straightforward way

(?:2[6-9]|[3-9][0-9]|100)(?=.*\n.*Apples)

I think this approach is more easy than the first one because you don't need to deal with such fancy words like "odd" or "even".

see, DEMO

Answer 4

Use

(2[5-9]|[3-9][0-9]|100)%.*\n.*Apples.*

if you need to capture all text.