Php find word in text using regular expression
问题 I want to find the whole words in text not a sub string. I have written following code. $str = 'its so old now.'; $a = 'so'; if (stripos($str,$a) !== false) { echo 'true'; } else { echo 'false'; } str1 = 'its so old now.'; str2 = 'it has some issue.'; I want to find word 'so' in text. it give true in both the string. But I want true in first case only because in second string 'so' contains in 'some' words. Thanks in advance 回答1: \b can be used in regex to match word boundaries. \bso\b Should