class Solution:
    def solve(self, text, patterns):
        n = len(text)
        bold = [False] * n
        for i in range(n):
            for p in patterns:
                if text[i:].startswith(p):
                    for j in range(len(p)):
                        bold[i + j] = True

        ans = ""
        for i in range(n):
            if bold[i] and (i == 0 or not bold[i - 1]):
                ans += " **"
            ans += text[i]
            if bold[i] and (i == n - 1 or not bold[i + 1]):
                ans += "** "
        return ans

ob = Solution()
text = "thisissampleline"
patterns = ["this", "ssam", "sample"]
print(ob.solve(text, patterns))

"thisissampleline"，["this"，"ssam"，"sample"]

<b>this</b>i<b>ssample</b>line