I.Text 
    A. Sub-section 1: This text
    B. Sub-section 2: This text
    C. Sub-section 3: This text

II. text
    A. Sub-section 1: This text 
    B. Sub-section 2: This text
III. text 
     A.Sub-section 1: This text 
   

i was expecting that i could extract the text after sub-section and add those into an array

The input is a long string

any solution will be nice with regex or string manipulation anything

CodePudding user response：

If you have all texts in a single variable, you can first use

    // multiline text
    let text = `I.Text 
    A. Sub-section 1: This text
    B. Sub-section 2: This text
    C. Sub-section 3: This text

II. text
    A. Sub-section 1: This text 
    B. Sub-section 2: This text
III. text 
     A.Sub-section 1: This text`,

    // get Sub-section parts until end of line
    sub_sections = text.match( /Sub-section\s?\d :[^\n]*/gi ),

    // get only text of Sub-section
    output = sub_sections.map( sub => 
        sub.replace( /Sub-section\s?\d :/i, "" ).trim()
    )
    
    console.log( output )

CodePudding user response：

Your question is not well defined. Here is a solution making these assumptions:

• you have lines with sections with header and sub-sections
• sub-sections have leading spaces
• you want to extract the text after : colon, and the text before and after the colon may vary
• the result should be an array of all subsection text after the colon

const input = ` I.Text 
    A. Sub-section 1: This text I.A
    B. Sub-section 2: This text I.B
    C. Sub-section 3: This text I.C

II. text
    A. Sub-section 1: This text II.A
    B. Sub-section 2: This text II.B
III. text 
    A.Sub-section 1: This text III.A
`;
const regex = /^ .*?: *(. )/gm;
const result = [...input.matchAll(regex)].map(m => m[1]);
console.log(result);

Output:

[
  "This text I.A",
  "This text I.B",
  "This text I.C",
  "This text II.A",
  "This text II.B",
  "This text III.A"
]

Explanation of regex:

• ^ -- start of line
• -- expect a space
• .*?: -- non-greedy scan for first colon
• * -- optional space
• (. ) -- capture group 1: everything to end of line with at least one char
• gm -- flags to macth multiple, and to treat start/end of line as start/end of string
• the regex can be tweak as needed in case the assumptions are not correct