javascript replace i into I

I need a javascript to replace i into I. This should apply to cases such as

• i'm good.
• So am i.
• He though i love him.

The standard ThisContent = ThisContent.replace("i", "I"); doesn't work because it replaces every i. I also thought of ThisContent = ThisC开发者_JS百科ontent.replace(" i ", " I "); but it doesn't work for the first and second case.

Any idea?

Use regex:

ThisContent = ThisContent.replace(/\bi\b/g, "I");

Here \b indicates a "word boundary", so only word-like i's will be replaced.