problem with regex, how to conclude more than one character

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  • tecspring@gmail.com
    #1

    problem with regex, how to conclude more than one character

    I always have no idea about how to express "conclude the entire word"
    with regexp, while using python, I encountered this problem again...

    for example, if I want to match the "string" in "test a string",
    re.findall(r"[^a]* (\w+)","test a string") will work, but what if
    there is not "a" but "an"(test a string)? the [^an] will failed
    because it will stop at the first character "a".

    I guess people not always use this kind of way to filter words?
    Here comes the real problem I encountered:
    I want to filter the text both in "<td>" block and the "<span>"'s
    title attribute
    ############### ####### code ############### ##############
    import re
    content='''<tr align="center" valign="middle" class="CellCss" ><td
    valign="middle" >LA</td><td valign="middle" >11/10/2008</td><td
    valign="middle" >1340/1430</td><td valign="middle" >PF1/5</td><td
    valign="middle" ><span title="Understa nding the stock market"
    class="MouseCur sor">Understand ....</span></td><td title="Charisma "
    valign="middle" >Charisma</td><td valign="middle" >Booked</td><td
    valign="middle" >'''

    re.findall(r''' <td valign="middle" >([^<]+)</td><td
    valign="middle" >([^<]+)</td><td valign="middle" >([^<]+)</td><td
    valign="middle" >([^<]+)</td><td valign="middle" ><span
    title="([^"]*)"''',conten t)

    ############### ##### code end ############### #############
    As you saw above,
    I get the results with "LA,11/10/2008,1340/1430,PF1/5,Understanding
    the stock market"
    there are two "<span>" block but I can just get the "title" attribute
    of the first "<span>" using regexp.
    for the second, which should be "Charisma" I need to use some kind of
    [^</td>]* to match "class="MouseCu rsor">Understan d....</span></td>",
    then I can continue match the second "<span>" block.

    Maybe I didn't describe this clearly, then feel free to tell me:)
    thanks for any further reply!
    Tags: None
    • tecspring@gmail.com
      #2
      Re: problem with regex, how to conclude more than one character

      On Nov 7, 3:06 pm, tecspr...@gmail .com wrote:
      I always have no idea about how to express "conclude the entire word"
      with regexp,  while using python, I encountered this problem again...
      >
      for example, if I want to match the "string" in "test a string",
      re.findall(r"[^a]* (\w+)","test a string") will work, but what if
      there is not "a" but "an"(test a string)? the [^an] will failed
      because it will stop at the first character "a".
      >
      I guess people not always use this kind of way to filter words?
      Here comes the real problem I encountered:
      I want to filter the text both in "<td>" block and the "<span>"'s
      title attribute
      ############### ####### code ############### ##############
      import re
      content='''<tr align="center" valign="middle" class="CellCss" ><td
      valign="middle" >LA</td><td valign="middle" >11/10/2008</td><td
      valign="middle" >1340/1430</td><td valign="middle" >PF1/5</td><td
      valign="middle" ><span title="Understa nding the stock market"
      class="MouseCur sor">Understand ....</span></td><td title="Charisma "
      valign="middle" >Charisma</td><td valign="middle" >Booked</td><td
      valign="middle" >'''
      >
      re.findall(r''' <td valign="middle" >([^<]+)</td><td
      valign="middle" >([^<]+)</td><td valign="middle" >([^<]+)</td><td
      valign="middle" >([^<]+)</td><td valign="middle" ><span
      title="([^"]*)"''',conten t)
      >
      ############### ##### code end ############### #############
      As you saw above,
      I get the results with "LA,11/10/2008,1340/1430,PF1/5,Understanding
      the stock market"
      there are two "<span>" block but I can just get the "title" attribute
      of the first "<span>" using regexp.
      for the second, which should be "Charisma" I need to use some kind of
      [^</td>]* to match "class="MouseCu rsor">Understan d....</span></td>",
      then I can continue match the second "<span>" block.
      >
      Maybe I didn't describe this clearly, then feel free to tell me:)
      thanks for any further reply!
      And by the way, I've tried both (!</td>) and (?:!</td>), many ways
      doesn't work.... so sad...

        Comment

        • Chris Rebert
          #3
          Re: problem with regex, how to conclude more than one character

          On Thu, Nov 6, 2008 at 11:06 PM, <tecspring@gmai l.comwrote:
          I always have no idea about how to express "conclude the entire word"
          with regexp, while using python, I encountered this problem again...
          >
          for example, if I want to match the "string" in "test a string",
          re.findall(r"[^a]* (\w+)","test a string") will work, but what if
          there is not "a" but "an"(test a string)? the [^an] will failed
          because it will stop at the first character "a".
          >
          I guess people not always use this kind of way to filter words?
          Here comes the real problem I encountered:
          I want to filter the text both in "<td>" block and the "<span>"'s
          title attribute
          Is there any particularly good reason why you're using regexps for
          this rather than, say, an actual (X)HTML parser?

          Cheers,
          Chris
          --
          Follow the path of the Iguana...
          Blog — chrisrebert.com
          http://rebertia.com

          ############### ####### code ############### ##############
          import re
          content='''<tr align="center" valign="middle" class="CellCss" ><td
          valign="middle" >LA</td><td valign="middle" >11/10/2008</td><td
          valign="middle" >1340/1430</td><td valign="middle" >PF1/5</td><td
          valign="middle" ><span title="Understa nding the stock market"
          class="MouseCur sor">Understand ....</span></td><td title="Charisma "
          valign="middle" >Charisma</td><td valign="middle" >Booked</td><td
          valign="middle" >'''
          >
          re.findall(r''' <td valign="middle" >([^<]+)</td><td
          valign="middle" >([^<]+)</td><td valign="middle" >([^<]+)</td><td
          valign="middle" >([^<]+)</td><td valign="middle" ><span
          title="([^"]*)"''',conten t)
          >
          ############### ##### code end ############### #############
          As you saw above,
          I get the results with "LA,11/10/2008,1340/1430,PF1/5,Understanding
          the stock market"
          there are two "<span>" block but I can just get the "title" attribute
          of the first "<span>" using regexp.
          for the second, which should be "Charisma" I need to use some kind of
          [^</td>]* to match "class="MouseCu rsor">Understan d....</span></td>",
          then I can continue match the second "<span>" block.
          >
          Maybe I didn't describe this clearly, then feel free to tell me:)
          thanks for any further reply!
          --
          Mailman 3 Info | python-list@python.org - python.org
          http://mail.python.org/mailman/listinfo/python-list

          >

            Comment

            • tecspring@gmail.com
              #4
              Re: problem with regex, how to conclude more than one character

              On Nov 7, 3:13 pm, "Chris Rebert" <c...@rebertia. comwrote:
              On Thu, Nov 6, 2008 at 11:06 PM,  <tecspr...@gmai l.comwrote:
              I always have no idea about how to express "conclude the entire word"
              with regexp,  while using python, I encountered this problem again...
              >
              for example, if I want to match the "string" in "test a string",
              re.findall(r"[^a]* (\w+)","test a string") will work, but what if
              there is not "a" but "an"(test a string)? the [^an] will failed
              because it will stop at the first character "a".
              >
              I guess people not always use this kind of way to filter words?
              Here comes the real problem I encountered:
              I want to filter the text both in "<td>" block and the "<span>"'s
              title attribute
              >
              Is there any particularly good reason why you're using regexps for
              this rather than, say, an actual (X)HTML parser?
              >
              Cheers,
              Chris
              --
              Follow the path of the Iguana...http://rebertia.com
              >
              >
              >
              ############### ####### code ############### ##############
              import re
              content='''<tr align="center" valign="middle" class="CellCss" ><td
              valign="middle" >LA</td><td valign="middle" >11/10/2008</td><td
              valign="middle" >1340/1430</td><td valign="middle" >PF1/5</td><td
              valign="middle" ><span title="Understa nding the stock market"
              class="MouseCur sor">Understand ....</span></td><td title="Charisma "
              valign="middle" >Charisma</td><td valign="middle" >Booked</td><td
              valign="middle" >'''
              >
              re.findall(r''' <td valign="middle" >([^<]+)</td><td
              valign="middle" >([^<]+)</td><td valign="middle" >([^<]+)</td><td
              valign="middle" >([^<]+)</td><td valign="middle" ><span
              title="([^"]*)"''',conten t)
              >
              ############### ##### code end ############### #############
              As you saw above,
              I get the results with "LA,11/10/2008,1340/1430,PF1/5,Understanding
              the stock market"
              there are two "<span>" block but I can just get the "title" attribute
              of the first "<span>" using regexp.
              for the second, which should be "Charisma" I need to use some kind of
              [^</td>]* to match "class="MouseCu rsor">Understan d....</span></td>",
              then I can continue match the second "<span>" block.
              >
              Maybe I didn't describe this clearly, then feel free to tell me:)
              thanks for any further reply!
              --
              http://mail.python.org/mailman/listinfo/python-list- Hide quoted text -
              >
              - Show quoted text -
              Really thanks for quickly reply Chris!
              Actually I tried BeautifulSoup and it's great.
              But I'm not very familiar with it and it need more codes to parse the
              html and get the right text.
              I think regexp is more convenient if there is a way to filter out the
              list just in one line:)
              I did this all the way but stopped here...

                Comment

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