I want to search "$_POST['something']" in a String by regex.
Tried it by textpad with following regex expression. ".*$_POST\['[a-zA-z0-9]*'\].*"
When same is used in java it is now working. ?
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You can test Java regex online at numerous sites, including regexplanet.com/advanced/java/index.htmljarmod– jarmod2013-03-30 18:42:42 +00:00Commented Mar 30, 2013 at 18:42
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3 Answers
You don't need the starting and trailing .*, but you do need to escape the $ as it has the special meaning of the zero-width end of the string.
\\$_POST\\['[a-zA-Z0-9]*'\\]
Comments
Use this:
"\\$_POST\\['([a-zA-Z0-9]*)'\\]"
Symbols like $have particular meanings in regex. Therefore, you need to prefix them with \
Comments
You can use the regex pattern given as a String with the matches(...) method of the String class. It returns a boolean.
String a = "Hello, world! $_POST['something'] Test!";
String b = "Hello, world! $_POST['special!!!char'] Test!";
String c = "Hey there $_GET['something'] foo bar";
String pattern = ".*\\$_POST\\['[A-Za-z0-9]+'\\].*";
System.out.println ("a matches? " + Boolean.toString(a.matches(pattern)));
System.out.println ("b matches? " + Boolean.toString(b.matches(pattern)));
System.out.println ("c matches? " + Boolean.toString(c.matches(pattern)));
You can also use a Pattern and a Matcher object to reuse the pattern for multiple uses:
String[] array = {
"Hello, world! $_POST['something'] Test!",
"Hello, world! $_POST['special!!!char'] Test!",
"Hey there $_GET['something'] foo bar"
};
String strPattern = ".*\\$_POST\\['[A-Za-z0-9]+'\\].*";
Pattern p = Pattern.compile(strPattern);
for (int i=0; i<array.length; i++) {
Matcher m = p.matcher(array[i]);
System.out.println("Expression: " + array[i]);
System.out.println("-> Matches? " + Boolean.toString(m.matches()));
System.out.println("");
}
outputs:
Expression: Hello, world! $_POST['something'] Test!
-> Matches? true
Expression: Hello, world! $_POST['special!!!char'] Test!
-> Matches? false
Expression: Hey there $_GET['something'] foo bar
-> Matches? false
