New submission from Shriramana Sharma <samj...@gmail.com>: Code:
import re cons_taml = "[கஙசஞடணதநபமயரலவழளறன]" print(re.findall("\\b" + cons_taml + "ை|ஐ", "ஐவர் பையன் இசை சிவிகை இல்லை இவ்ஐ")) cons_deva = "[कखगघङचछजझञटठडढणतथदधनपफबभमयरलवशषसह]" print(re.findall("\\b" + cons_deva + "ै|ऐ", "ऐषमः तैलम् ईडै समीशै ईक्षै ईक्ऐ")) Specs: Kubuntu Xenial 64 bit Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] on linux Actual Output: ['ஐ', 'பை', 'கை', 'லை', 'ஐ'] ['ऐ', 'तै', 'शै', 'षै', 'ऐ'] Expected Output: ['ஐ', 'பை'] ['ऐ', 'तै'] Rationale: The formulated RE desires to identify words *starting* with the vowel /ai/ (\u0BC8 ை in Tamil script and \u0948 ै in Devanagari as vowel sign or \u0B90 ஐ \u0910 ऐ as independent vowel). ஐவர் பையன் and ऐषमः तैलम् are the only words fitting this criterion. \b is defined to mark a word boundary and is here applied at the beginning of the RE. Observation: There seems to be some assumption that only GC=Lo characters constitute words. Hence the false positives at ச ி வ ி (க ை) and स म ी (श ै) where the ி and ी are vowel signs, and இ ல ் (ல ை) and ई क ् (ष ै) where the ் and ् are virama characters or vowel cancelling signs. In Indic, such GC=Mc and GC=Mn characters are inalienable parts of words. They should be properly identified as parts of words and no word boundary answering to \b should be generated at their positions. ---------- components: Regular Expressions messages: 307430 nosy: ezio.melotti, jamadagni, mrabarnett priority: normal severity: normal status: open title: \b reports false-positives in Indic strings involving combining marks type: behavior versions: Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32198> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com