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Whiplace performs fast stream multiple replacement. Get the source code and history from github.com. Getting started: git clone email@example.com:gui11aume/whiplace.git cd whiplace make ./whiplace ./whiplace tests/keytest.txt tests/targetest.txt The key file must consist of one key-value pair per line, separated by a tab. Subsequent tabs, if any, will be part of the value. Keys specify what to match, values what to replace the match with. Specifying no value leads to deletion of the key (and lines with no key are ignored). Maximal match If several keys match the same position, whiplace will use the longest (actually largest in dictionary order). For example, 'abc' and 'ab' are possible matches against 'abcd'. In that case, 'abc' will be used and not 'ab', because the match is longer. So 'ab' is a match only when not followed by 'c', like in 'abde'. Match collisions Note that in the previous example 'bcd' would not match 'abcd' because 'abc' matches before, masking those letters from other possible matches. Match protection If you want the occurrences of 'abc' to be replaced but not the occurrences of 'abcd', add a line to the key file where both key and value are 'abcd'.