Replacing Version Numbers with Python re (Regex Replacement Only Within Parentheses)
2018-09-21 12:37 (6 years ago)
ytyng
The file looks like
version_number = "19";
and when you want to replace that file using a regular expression,
version_number = "(\d+)";
you want to use only the version number as the regular expression pattern without enclosing the other parts in pattern symbols.
However, after replacing, you want to obtain a string that includes version_number, such as
version_number = "20";
regex = re.compile('version_number = "(\d+)";')
def _replace(match):
startindex = match.regs[1][0] - match.regs[0][0]
end_index = match.regs[0][1] - match.regs[1][1]
return match.group(0)[:startindex] + str(value) + match.group(0)[-end_index:]
return regex.sub(_replace, self.get_source_code())
In this way, the match indices are stored in match.regs within the _replace callback, so by slicing the string with those indices, it might work well.
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