Replacing words in a string

GrahamL

Hi
If I have a string -
@
QString s = "Some text MyWord some more text MyWordAgain"
@
Now I want to replace occurrences of 'MyWord' but ONLY where that is the whole word, so that in the above example 'MyWordAgain' would not be replaced.
I tried
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s.replace("MyWord","AnotherWord")
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but obviously it replaced both occurrences.
How can I achieve this?

Thanks

NicuPopescu

-use QString::indexOf to find the index of the first occurrence
-use QString & QString::replace ( int position, int n, const QString & after )

SGaist

Hi,

You can also use QRegularExpression/QRegExp depending whether you're using Qt 5 or Qt 4

GrahamL

Hi
I tried with regular expressions but cannot get a match
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QRegualrExpression regExp("\bMyWord");
str.replace(regExp,"Another");
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Can anyone suggest what is wrong with my regular expression?

Thanks

IamSumit

Try it ...
QString str="Some text MyWord some more text MyWordAgain";
s.replace(" MyWord "," AnotherWord "); //both strings having one character spaces before and after .

GrahamL

Thanks all

NicuPopescu

bq. Try it …
QString str=“Some text MyWord some more text MyWordAgain”;
s.replace(” MyWord “,” AnotherWord “); //both strings having one character spaces before and after .

this is a particular case ... what if you'd want to replace substring within a word or the substring to replace is at the beginning of the string(without leading space character)?

GrahamL

Ok So my problem is not solved
I need to replace all occurrences of a word in a string
So I created a QRegularExpression -
@
QRegualrExpression regexp("\bWord");
QString s = "this Word is to be replaced and this Word but not this Wordaaaa";
s.replace(rexexp,"NewWord");
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This has the effect of setting s to
@
this NewWord is to be replaced and the NewWord but not this NewWordaaaa
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How can I stop the last substitution being made?

Thanks again

NicuPopescu

try this:

@QRegualrExpression regexp("\bWord\b");@