compile « regex « Python Data Type Q&A

1. Caching compiled regex objects in Python?    stackoverflow.com

Each time a python file is imported that contains a large quantity of static regular expressions, cpu cycles are spent compiling the strings into their representative state machines in memory.

a = ...

2. Does re.compile() or any given Python library call throw an exception?    stackoverflow.com

I can't tell from the Python documentation whether the re.compile(x) function may throw an exception (assuming you pass in a string). I imagine there is something that could be considered an ...

3. What property returns the regular expression used when re.compile was called?    stackoverflow.com

def foo ():
   x = re.compile('^abc')

   foo2(x)

def foo2(x):

   # How do I get x to return '^abc'?
   logging.info('x is ' + x.???)

4. Is it worth using Python's re.compile?    stackoverflow.com

Is there any benefit in using compile for regular expressions in Python?

h = re.compile('hello')
h.match('hello world')

re.match('hello', 'hello world')

5. Case insensitive Python regular expression without re.compile    stackoverflow.com

In Python, I can compile a regular expression to be case-insensitive using re.compile:

>>> s = 'TeSt'
>>> casesensitive = re.compile('test')
>>> ignorecase = re.compile('test', re.IGNORECASE)
>>> 
>>> print casesensitive.match(s)
None
>>> print ignorecase.match(s)
<_sre.SRE_Match object at 0x02F0B608>

6. Is there any regular expression engine which do Just-In-Time compiling?    stackoverflow.com

My Questions is Is there any regular expression engine which do Just-In-Time compiling during regex pattern parsing and use when matching/replacing the texts? or where can I learn JIT for i386 or ...

7. Compiling a regex inside a function that's called multiple times    stackoverflow.com

If you compile a regex inside a function, and that function gets called multiple times, does Python recompile the regex each time, or does Python cache the compiled regex (assuming the ...

8. Is there a way to really pickle compiled regular expressions in python?    stackoverflow.com

I have a python console application that contains 300+ regular expressions. The set of regular expressions is fixed for each release. When users run the app, the entire set ...

9. Python and re.compile return inconsistent results    stackoverflow.com

I'm trying to replace all instances of href="../directory" with href="../directory/index.html". In Python, this

reg = re.compile(r'<a href="../(.*?)">')
for match in re.findall(reg, input_html):
    output_html = input_html.replace(match, match+'index.html')

href="../personal-autonomy/index.htmlindex.htmlindex.htmlindex.html"  
href="../paternalism/index.html" ...

10. Type of compiled regex object in python    stackoverflow.com

What is the type of the compiled regular expression in python? In particular, I want to evaluate

isinstance(re.compile(''), ???)

11. Using a global flag for python RegExp compile    stackoverflow.com

Would it be possible to define a global flag so that Python's re.compile() automatically sets it ? For instance I want to use re.DOTALL flag for all my RegExp in -- ...

12. re.compile regexp problem    python-forum.org

Hi, I have a XML-coded txt-file, where I want to run a function on all strings within sertain tags. I first just used the re.sub function. import re string = re.sub("(.+)", function(), xml_file) This works fine for one-lined strings. Problem is that some strings are more than one line, and since (.+) wont replace newline, I added re.DOTALL flag like this. ...