--description--

Given a string that may include some bold text in Markdown, return the equivalent HTML string.

• Bold text in Markdown is any text that starts and ends with two asterisks (**) or two underscores (__).
• There cannot be any spaces between the text and the asterisks or underscores, but there can be spaces in the text itself.
• Convert all bold occurrences to HTML b tags and return the string.

For example, given "**This is bold**", return "<b>This is bold</b>".

Note: The console may not display HTML tags in strings when logging messages. Check the browser console to see logs with tags included.

--hints--

parse_bold("**This is bold**") should return "<b>This is bold</b>".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(parse_bold("**This is bold**"), "<b>This is bold</b>")`)
}})

parse_bold("__This is also bold__") should return "<b>This is also bold</b>".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(parse_bold("__This is also bold__"), "<b>This is also bold</b>")`)
}})

parse_bold("**This is not bold **") should return "**This is not bold **".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(parse_bold("**This is not bold **"), "**This is not bold **")`)
}})

parse_bold("__ This is also not bold__") should return "__ This is also not bold__".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(parse_bold("__ This is also not bold__"), "__ This is also not bold__")`)
}})

parse_bold("The **quick** brown fox __jumps__ over the **lazy** dog.") should return "The <b>quick</b> brown fox <b>jumps</b> over the <b>lazy</b> dog.".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(parse_bold("The **quick** brown fox __jumps__ over the **lazy** dog."), "The <b>quick</b> brown fox <b>jumps</b> over the <b>lazy</b> dog.")`)
}})

--seed--

--seed-contents--

def parse_bold(markdown):

    return markdown

--solutions--

import re
def parse_bold(markdown):
    markdown = re.sub(r'\*\*(\S(?:.*?\S)?)\*\*', r'<b>\1</b>', markdown)
    markdown = re.sub(r'__(\S(?:.*?\S)?)__', r'<b>\1</b>', markdown)

    return markdown