提取正则表达式中的特定单词

Question

I'm struggling a little with a regular expression here.

I have a sentence like this: "what is the date of birth of John Smith". I would like to extract the keywords [date of birth] but I'm not sure how to do it since the word of is also present later in the sentence.

Thanks, Gwendal

Answer 1

If you want only to check the presence of the string date of birth then use the String contains(CharSequence s) method.

Usage

String str="what is the date of birth of John Smith";
str.contains("date of birth"); // Returns in Boolean whether the char sequence is present in s

If you want to know the first occurrence of the specified substring use int indexOf(String str) method

Usage

String str="what is the date of birth of John Smith";
str.indexOf("date of birth"); // Returns the first pos of occurence of the substring

Check this page for more information on String