Regular expression for stock tickers - Python

I have a list of tweets. They look like this:

data = [['trading $aa $BB stock market info'], ['$aa is $116 market is doing well $cc $ABC']] 

I want to extract stock tickers:

['$aa', '$BB'] ['$aa', '$cc', '$ABC']] 

I have tried this:

for i in data: print re.findall(r'[$]\S*', str(i)) 

And, the output contains $116 as well:

['$aa', '$BB'] ['$aa', '$116', '$cc', '$ABC']] 

Any suggestions?

2 Answers

Match the dollar sign, one letter, and then anything that's not a space:

re.findall(r'[$][A-Za-z][\S]*', str(i)) 

The package reticker does this by creating a custom regular expression as per its configuration. It uses the created pattern to extract tickers from text. Alternatively, the returned pattern can be used independently.

>>> import reticker >>> extractor = reticker.TickerExtractor() >>> type(extractor.pattern) <class 're.Pattern'> >>> extractor.extract("Comparing FNGU vs $WEBL vs SOXL- who wins? And what about $cldl vs $Skyu? IMHO, SOXL is king!\nBTW, will the $w+$Z pair still grow?") ['FNGU', 'WEBL', 'SOXL', 'CLDL', 'SKYU', 'W', 'Z'] >>> extractor.extract("Which of BTC-USD, $ETH-USD and $ada-usd is best?\nWhat about $Brk.a and $Brk.B? Compare futures MGC=F and SIL=F.") ['BTC-USD', 'ETH-USD', 'ADA-USD', 'BRK.A', 'BRK.B', 'MGC=F', 'SIL=F']