how to check wheather a string has a word followed by a number or not

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Regex can help us check it:String test="top 10 products";and  and  System.out.println(test.replaceAll(".*?\w+\s+(\d+).*", "$1"));But, and This will return the entire String in case there is no "Word[space]digits" in the String. You will have to do a length check for the actual String and the returned String. If the length is same, then your String doesn't contain the expected pattern.If you only want to extract a possible number after single / first occurrence of "top", that's a viable way. Don't forget to check for existence of the word, and that there's something behind it at all.You can also use regular expression for this, which will need a bit less error checking:top\s+([0-9]+)You could even make a Pattern out of this, and then iterate the Matcher.find() method and extract the numbers for multiple matches:Pattern pat = Pattern.compile("top\s+([0-9]+)");Matcher matcher = pat.matcher("top 10 products or top 20 products");while (matcher.find()) {and  and  System.out.println(matcher.group(1));}

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how to check wheather a string has a word followed by a number or not

zack mathews

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