Regex doesn t work in String matches

Question

I have this small piece of code  String   words      apf   hum    dkoe   12f    for String s words        if s matches   a-z                   System out println s             Supposed to print   dkoe   but it prints nothing

User · Answer

Your regular expression  a-z  doesn t match dkoe since it only matches Strings of lenght 1  Use something like  a-z

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a-z  matches a single char between a and z  So  if your string was just  d   for example  then it would have matched and been printed out    You need to change your regex to  a-z   to match one or more chars

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String matches returns whether the whole string matches the regex  not just any substring

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Welcome to Java s misnamed  matches   method    It tries and matches ALL the input  Unfortunately  other languages have followed suit     If you want to see if the regex matches an input text  use a Pattern  a Matcher and the  find   method of the matcher   Pattern p   Pattern compile   a-z     Matcher m   p matcher inputstring   if  m find           match   If what you want is indeed to see if an input only has lowercase letters  you can use  matches    but you need to match one or more characters  append a   to your character class  as in  a-z    Or use   a-z    and  find

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java s implementation of regexes try to match the whole string  that s different from perl regexes  which try to find a matching part  if you want to find a string with nothing but lower case characters  use the pattern  a-z    if you want to find a string containing at least one lower case character  use the pattern    a-z

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you must put at least a capture    in the pattern to match  and correct pattern like this   String   words      apf   hum    dkoe   12f    for String s words        if s matches     a-z                      System out println s

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I have faced the same problem once   Pattern ptr   Pattern compile    a-zA-Z        a-zA-Z  s         The above failed   Pattern ptr   Pattern compile     a-zA-Z        a-zA-Z  s          The above worked with pattern within   and

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You can make your pattern case insensitive by doing   Pattern p   Pattern compile   a-z     Pattern CASE INSENSITIVE

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Used  String   words      apf   hum    dkoe   12f        for String s words                if s matches   a-z                            System out println s

[java] Regex doesn't work in String.matches()

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