JavaVerbalExpressions
VerbalExpressions is a Java library that helps to construct difficult regular expressions.
Getting Started
Maven Dependency:
<dependency>
<groupId>ru.lanwen.verbalregex</groupId>
<artifactId>java-verbal-expressions</artifactId>
<version>1.4</version> </dependency>You can use SNAPSHOT dependency with adding to pom.xml:
<repositories>
<repository>
<id>ossrh</id>
<url>https://oss.sonatype.org/content/repositories/snapshots</url>
</repository> </repositories>Examples
VerbalExpression testRegex = VerbalExpression.regex()
.startOfLine().then("http").maybe("s")
.then("://")
.maybe("www.").anythingBut(" ")
.endOfLine()
.build();
// Create an example URL String url = "https://www.google.com"; // Use VerbalExpression's testExact() method to test if the entire string matches the regex testRegex.testExact(url);
//True testRegex.toString();
// Outputs the regex used:
// ^(?:http)(?:s)?(?:\:\/\/)(?:www\.)?(?:[^\ ]*)$ VerbalExpression testRegex = VerbalExpression.regex()
.startOfLine().then("abc").or("def")
.build();
String testString = "defzzz"; //Use VerbalExpression's test() method to test if parts if the string match the regex testRegex.test(testString);
// true testRegex.testExact(testString);
// false testRegex.getText(testString);
// returns: defBuilder can be cloned:
VerbalExpression regex = regex(regex().anything().addModifier('i')).endOfLine().build();
Or can be used in another regex:
VerbalExpression.Builder digits = regex().capt().digit().oneOrMore().endCapt().tab();
VerbalExpression regex2 = regex().add(digits).add(digits).build();
Feel free to use any predefined char groups:
regex().wordChar().nonWordChar()
.space().nonSpace()
.digit().nonDigit()Define captures:
String text = "aaabcd"; VerbalExpression regex = regex()
.find("a")
.capture().find("b").anything().endCapture().then("cd").build();
regex.getText(text)
// returns "abcd" regex.getText(text, 1) // returns "b"More complex examples
Other implementations
You can view all implementations on VerbalExpressions.github.io
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