How to use regex in String contains method in Java

Question

I want to check if a String contains the words  stores    store   and  product  in that order  no matter what is in between them   I tried using someString contains stores store product   and also  contains  stores store product     Do I need to explicitly declare a regex and pass it on the method or can I not pass a regex at all

User · Answer

matcher find   does what you needed  Example   Pattern compile  stores  store  product   matcher someString  find

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As of Java 11 one can use Pattern asMatchPredicate which returns Predicate lt String gt   String string    quot stores store product quot   String regex    quot stores  store  product   quot   Predicate lt String gt  matchesRegex   Pattern compile regex  asMatchPredicate     boolean match   matchesRegex test string                        true  The method enables chaining with other String predicates  which is the main advantage of this method as long as the Predicate offers and  or and negate methods  String string    quot stores store product quot   String regex    quot stores  store  product   quot    Predicate lt String gt  matchesRegex   Pattern compile regex  asMatchPredicate    Predicate lt String gt  hasLength   s - gt  s length    gt  20   boolean match   hasLength and matchesRegex  test string         false

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public static void main String   args        String test    something hear - to - find some to or tows       System out println  1 result      contains  - to -    w   som   test  null        System out println  2 result      contains  - to -    w   som   test  5      static boolean contains String pattern  String text  Integer fromIndex       if fromIndex    null  amp  amp  fromIndex  lt  text length            return Pattern compile pattern  matcher text  find         return Pattern compile pattern  matcher text  find        1 result  true  2 result  true

User · Answer

String contains  String contains works with String  period  It doesn t work with regex  It will check whether the exact String specified appear in the current String or not   Note that String contains does not check for word boundary  it simply checks for substring   Regex solution  Regex is more powerful than String contains  since you can enforce word boundary on the keywords  among other things   This means you can search for the keywords as words  rather than just substrings   Use String matches with the following regex      s     bstores  b    bstore  b    bproduct  b      The RAW regex  remove the escaping done in string literal - this is what you get when you print out the string above      s    bstores b   bstore b   bproduct b     The  b checks for word boundary  so that you don t get a match for restores store products  Note that stores 3store product is also rejected  since digit and   are considered part of a word  but I doubt this case appear in natural text   Since word boundary is checked for both sides  the regex above will search for exact words  In other words  stores stores product will not match the regex above  since you are searching for the word store without s     normally match any character except a number of new line characters    s  at the beginning makes   matches any character without exception  thanks to Tim Pietzcker for pointing this out

User · Answer

You can simply use matches method of String class   boolean result   someString matches  stores  store  product

User · Answer

If you want to check if a string contains substring or not using regex  the closest you can do is by using find   -        private static final validPattern        bstores  b    bstore  b    bproduct  b      Pattern pattern   Pattern compile validPattern       Matcher matcher   pattern matcher inputString       System out print matcher find        should print true or false    Note the difference between matches   and find    matches   return true if the whole string matches the given pattern  find   tries to find a substring that matches the pattern in a given input string  Also by using find   you don t have to add extra matching like -   s    at the beginning and    at the end of your regex pattern

[java] How to use regex in String.contains() method in Java

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