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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: regular expressions in Stata |

Date |
Tue, 13 Sep 2005 21:03:49 +0100 |

By the way, and putting on a hat as one of the Editors of the Stata Journal: we would like to carry something longer and expository in the Stata Journal on regular expressions, and at least one (person|cyborg) has expressed serious interest in writing that. Nick n.j.cox@durham.ac.uk scott hankins > The "V" is there because I [...] tried to do two things > at once. Nick Cox > > "76(4|5).3" > > > > and > > > > "^76(4|5).3" > > > > both seem to work here. What's that "V" doing? scott hankins > > > I am trying to use the new regex functions and am having > some issues. > > > > > > I am familiar (but not an expert) with regular > expressions in Perl and > > > I am problems applying that knowledge in Stata. Does > anyone know how > > > regular expressions are implemented in Stata? Ideally, I > would like > > > more than "Regular expression syntax is based on Henry > Spencer's NFA > > > algorithm and as such, is nearly identical to the POSIX.2 > standard." > > > as I have not been able to find a clear exposition of the POSIX.2 > > > standard online (I am sure there is one, I just can't > find it :) ). > > > > > > > > > *********************************** > > > here is my problem > > > > > > pdx > > > 76403 > > > 76403 > > > 76513 > > > 76503 > > > > > > > > > I tried the following code but it did not find any matches, this > > > should find all 4 of the above occurrences. > > > > > > replace weight = 3 if regexm(pdx,"V76(4|5).3") > > > > * > > * For searches and help try: > > * http://www.stata.com/support/faqs/res/findit.html > > * http://www.stata.com/support/statalist/faq > > * http://www.ats.ucla.edu/stat/stata/ > > > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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