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I imported a text and seperated al words by using StringCases. After this I would like to manipulate the text, for example to replace all singular verbs to plural. When I use StringReplace, then Mathematica search for a part of the string and replaced it.

For example

texttest = "walking walk routes walks"
texttest1 = StringCases[texttest, RegularExpression["\\w(?<!\\d)[\\w'-]*"]];
newwords= {"walk" -> "walking", "walks" -> "walking"};
texttest2 = StringReplace[texttest1, newwords];

The result is:

{"walkinging", "walking", "routes", "walkings"}

I would like to get: {"walking", "walking", "routes", "walking"}.

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up vote 2 down vote accepted
texttest = "walking walk routes walks"
StringSplit[texttest, " "] /. {"walk" -> "walking", "walks" -> "walking"}

{"walking", "walking", "routes", "walking"}

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