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Explain a complex regex used by strip_rtf

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Jeffrey S. Smith 2013-09-10 15:36:46 -05:00
parent 53ac150337
commit 30618ad60c
1 changed files with 6 additions and 0 deletions
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6
openlp/plugins/songs/lib/__init__.py
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@ -46,6 +46,12 @@ log = logging.getLogger(__name__)
WHITESPACE = re.compile(r'[\W_]+', re.UNICODE)
APOSTROPHE = re.compile('[\'`’ʻ′]', re.UNICODE)
# PATTERN will look for the next occurence of one of these symbols:
# \controlword - optionally preceded by \*, optionally followed by a number
# \'## - where ## is a pair of hex digits, representing a single character
# \# - where # is a single non-alpha character, representing a special symbol
# { or } - marking the beginning/end of a group
# a run of characters without any \ { } or end-of-line
PATTERN = re.compile(r"(\\\*)?\\([a-z]{1,32})(-?\d{1,10})?[ ]?|\\'([0-9a-f]{2})|\\([^a-z*])|([{}])|[\r\n]+|([^\\{}\r\n]+)", re.I)
# RTF control words which specify a "destination" to be ignored.
DESTINATIONS = frozenset((