def pattern(self, format): """Return regex pattern for the format string. Need to make sure that any characters that might be interpreted as regex syntax are escaped. """ processed_format = '' # The sub() call escapes all characters that might be misconstrued # as regex syntax. Cannot use re.escape since we have to deal with # format directives (%m, etc.). regex_chars = re_compile(r"([\\.^$*+?\(\){}\[\]|])") format = regex_chars.sub(r"\\\1", format) whitespace_replacement = re_compile('\s+') format = whitespace_replacement.sub('\s+', format) while '%' in format: directive_index = format.index('%') + 1 processed_format = "%s%s%s" % (processed_format, format[:directive_index - 1], self[format[directive_index]]) format = format[directive_index + 1:] return "%s%s" % (processed_format, format)
def pattern(self, format): """Return regex pattern for the format string. Need to make sure that any characters that might be interpreted as regex syntax are escaped. """ processed_format = '' # The sub() call escapes all characters that might be misconstrued # as regex syntax. Cannot use re.escape since we have to deal with # format directives (%m, etc.). regex_chars = re_compile(r"([\\.^$*+?\(\){}\[\]|])") format = regex_chars.sub(r"\\\1", format) whitespace_replacement = re_compile('\s+') format = whitespace_replacement.sub('\s+', format) while '%' in format: directive_index = format.index('%')+1 processed_format = "%s%s%s" % (processed_format, format[:directive_index-1], self[format[directive_index]]) format = format[directive_index+1:] return "%s%s" % (processed_format, format)
def compile(self, format): """Return a compiled re object for the format string.""" return re_compile(self.pattern(format), IGNORECASE)