CODEWITHSUNDEEP
javascriptstring
You Ma
You Ma

Reputation: 189

How to find a specific word between two sentences in a text file

Suppose this is my text file info.txt : 

My Name is 
Joe
My Age is 
25
My phone is
Nokia

Is there an efficient way to return 25 with Javascript (Knowing that it comes in the line after"My Age is" ?

I'm using vanilla Javascript and FileReader

Upvotes: 1

Views: 217

Answers (3)

Thielicious
Thielicious

Reputation: 4452

txt.split(/Age.+/)[1].match(/.+/)

I would use .split() as a cursor.

let txt = 
`My Name is 
Joe
My Age is 
25
My phone is
Nokia`,

age = txt.split(/Age.+/)[1].match(/.+/)[0]

console.log(age)

Split the text content at the line that contains Age and match the next line.

Upvotes: 1

craig_h
craig_h

Reputation: 32704

You can simply use RegEx for that:

let matches = str.match(/My Age Is\s?\n([0-9]+)/i)
let age = matches[1];

Here's the JSFiddle: https://jsfiddle.net/tee3y172/

And, here's how that breaks down:

  • My Age Is - Match this string
  • \s? - possibly followed by a space (in your example it is followed by a space)
  • \n - Followed by a new line
  • ([0-9]+) - Followed by any series of numbers (you could also use \d+) and group them (that's what the perenthesis are for).
  • i - ignore case

The grouping then allows you to capture the text you want at index 1 (matches[1]).

For matching anything on the line after "My age is" you can use the (.*) which will match anything except a newline:

let matches = str.match(/My Age Is\s?\n(.*)/i)
let age = (!!matches) ? matches[1] : 'No match';

Here's the JSFiddle for that: https://jsfiddle.net/spadLeqw/

Upvotes: 1

Andy
Andy

Reputation: 63524

The simplest method is to use a regular expression to match the digits that come after specific words

const str = 'My Name is\nJoe\nMy Age is \n25\nMy phone is\nNokia';
const match = str.match(/My Age is \n(\d+)/)[1];
console.log(match);

Additional resources

Upvotes: 1

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