Python and regular expression with Unicode


Question

I need to delete some Unicode symbols from the string 'بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ'

I know they exist here for sure. I tried:

re.sub('([\u064B-\u0652\u06D4\u0670\u0674\u06D5-\u06ED]+)', '', 'بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ')

but it doesn't work. String stays the same. What am I doing wrong?

1
80
8/9/2017 11:05:34 AM

Accepted Answer

Are you using python 2.x or 3.0?

If you're using 2.x, try making the regex string a unicode-escape string, with 'u'. Since it's regex it's good practice to make your regex string a raw string, with 'r'. Also, putting your entire pattern in parentheses is superfluous.

re.sub(ur'[\u064B-\u0652\u06D4\u0670\u0674\u06D5-\u06ED]+', '', ...)

http://docs.python.org/tutorial/introduction.html#unicode-strings

Edit:

It's also good practice to use the re.UNICODE/re.U/(?u) flag for unicode regexes, but it only affects character class aliases like \w or \b, of which this pattern does not use any and so would not be affected by.

105
12/26/2008 4:03:26 PM

Use unicode strings. Use the re.UNICODE flag.

>>> myre = re.compile(ur'[\u064B-\u0652\u06D4\u0670\u0674\u06D5-\u06ED]+', 
                      re.UNICODE)
>>> myre
<_sre.SRE_Pattern object at 0xb20b378>
>>> mystr = u'بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ'
>>> result = myre.sub('', mystr)
>>> len(mystr), len(result)
(38, 22)
>>> print result
بسم الله الرحمن الرحيم

Read the article by Joel Spolsky called The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)


Licensed under: CC-BY-SA with attribution
Not affiliated with: Stack Overflow
Icon