python-docx regex: replace any word in docx text

[Gribouillis]

def replace(input_file,key,value,Numberlist,output_file):
    # Input_file: path of file, key: word to change,value: word change,Numberlist: ordinal number of words to change
    # Output: file save with new file have value
    doc = Document(input_file)
    numberset = set(Numberlist)
    for p in doc.paragraphs:
        inline = p.runs
        match = re.finditer(key,p.text,re.IGNORECASE) #find key 
        for n, igkey in enumerate(match, 1):
            if n not in numberset:
                continue
            L_key = igkey.group()
            for j in range(len(inline)):
                if L_key in inline[j].text:
                    text = inline[j].text.replace(L_key, value)
                    inline[j].text = text
        #print(p.text)
    doc.save(output_file)

The effect of enumerate is to iterate on pairs (1, matchobj), (2, matchobj), (3, matchobj), ... instead of just match objects. Use the index n to reject occurrences that are not pointed to by Numberlist.

Edit: I realize that it will take the same numbers in every paragraph, this may not be what you want...