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    <p>You can use the <code>index()</code> function to find your dashes, then with that knowledge you can take the rest of the string past that point. For instance, </p> <pre><code>mydict = {"g18_84pp_2A_MVP1_GoodiesT0-HKJ-DFG_MIX-CMVP1_Y1000-MIX.txt" : 0, "g18_84pp_2A_MVP2_GoodiesT0-HKJ-DFG_MIX-CMVP2_Y1000-MIX.txt" : 1, "g18_84pp_2A_MVP3_GoodiesT0-HKJ-DFG_MIX-CMVP3_Y1000-MIX.txt" : 2, "g18_84pp_2A_MVP4_GoodiesT0-HKJ-DFG_MIX-CMVP4_Y1000-MIX.txt" : 3, "g18_84pp_2A_MVP5_GoodiesT0-HKJ-DFG_MIX-CMVP5_Y1000-MIX.txt" : 4, "g18_84pp_2A_MVP6_GoodiesT0-HKJ-DFG_MIX-CMVP6_Y1000-MIX.txt" : 5, "g18_84pp_2A_MVP7_GoodiesT0-HKJ-DFG_MIX-CMVP7_Y1000-MIX.txt" : 6, "h18_84pp_3A_MVP1_GoodiesT1-HKJ-DFG_MIX-CMVP1_Y1000-FIX.txt" : 7, "h18_84pp_3A_MVP2_GoodiesT1-HKJ-DFG_MIX-CMVP2_Y1000-FIX.txt" : 8, "h18_84pp_3A_MVP2_GoodiesT1-HKJ-DFG_MIX-CMVP3_Y1000-FIX.txt" : 9} for value in sorted(mydict.iterkeys()): index = value.index('-') extracted = value[index+1:-4] # Goes past the first occurrence of - and removes .txt from the end print extracted[-3:] # Find the last 3 letters in the string </code></pre> <p>Will print the following:</p> <pre><code>MIX MIX MIX MIX MIX MIX MIX FIX FIX FIX </code></pre> <p>Then if statements can be used to do what you would like.</p> <p>If you want to extract just the common part.</p> <pre><code>index = value.index('-') extracted = value[:index] # Will get g18_84pp_2A_MVP1_GoodiesT0 </code></pre> <p>Then to figure out the ending to use. If you know the ending of the mydict value will always be MIX.txt or FIX.txt then you can do this.</p> <pre><code>for value in sorted(mydict.iterkeys()): ending = value[-7:-4] index = value.index('-') extracted = value[:index] print "%s_%s" % (extracted, ending) </code></pre> <p>Which prints </p> <pre><code>g18_84pp_2A_MVP1_GoodiesT0_MIX g18_84pp_2A_MVP2_GoodiesT0_MIX g18_84pp_2A_MVP3_GoodiesT0_MIX g18_84pp_2A_MVP4_GoodiesT0_MIX g18_84pp_2A_MVP5_GoodiesT0_MIX g18_84pp_2A_MVP6_GoodiesT0_MIX g18_84pp_2A_MVP7_GoodiesT0_MIX h18_84pp_3A_MVP1_GoodiesT1_FIX h18_84pp_3A_MVP2_GoodiesT1_FIX h18_84pp_3A_MVP2_GoodiesT1_FIX </code></pre> <p>Then you add it to the extracted dictionary.</p>
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    1. POHow to extract the common words before particular symbol and find particular word
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    1. USnwalsh
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    1. CO@nwalshThank you. About point 1 the common part? Do you have any suggestion?
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      1. USShengen
    2. CO@Shengen updated answer to include that.
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      1. USnwalsh
    3. CO@nwalshIt's always ending with MIX.txt and FIX.txt, thank you. It works well.
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