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I have a long list of words, one word per line. I want to paste cw| before each word on every line. How can I achieve this?

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you don't have to post it twice, correct the punctuation, add some examples as to what you want to do. – Sathya Mar 27 '12 at 11:49

If you want to insert text in the beginning of each line try this:
UPDATED

Open Replace dialog (Search->Replace)
    Check "Regular expression" flag in "Search Mode" panel.
    Enter "^(.+)$" (line ending symbol) in "Find what" field.
    Enter "cw|\1" (your text+\1) in "Replace with:" field.
    Press "Replace All"


Regular expressions
You can also run replace in the selection.

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Thank you so much for your help, it worked a treat. – skok Mar 27 '12 at 12:34

Press control + H, replace ^ with cw|. Make sure you are in regular expression mode.

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Thanks for the help, it worked. – skok Mar 27 '12 at 12:35
1  
Care to explain how this works? – Ivo Flipse Mar 27 '12 at 13:11
    
This is using regular expressions. ^ in regular expressions speak means "match start of string". Since you only want to match all start of each line, there is no need to specify anything after the ^. – JackeJR Mar 29 '12 at 9:33

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