diff --git a/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/RegexAutomaton.java b/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/RegexAutomaton.java
index b07061f0d..fafe115a8 100644
--- a/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/RegexAutomaton.java
+++ b/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/RegexAutomaton.java
@@ -471,14 +471,35 @@ public RegexAutomaton repeat(long n) {
 		return toRegex().simplify().repeat(n).toAutomaton(this).minimize();
 	}
 
+	/**
+	 * Yields a new automaton where leading whitespaces have been removed from
+	 * {@code this}.
+	 * 
+	 * @return a new automaton where leading whitespaces have been removed from
+	 *             {@code this}
+	 */
 	public RegexAutomaton trimLeft() {
 		return this.toRegex().trimLeft().simplify().toAutomaton(this);
 	}
 
+	/**
+	 * Yields a new automaton where trailing whitespaces have been removed from
+	 * {@code this}.
+	 * 
+	 * @return a new automaton where trailing whitespaces have been removed from
+	 *             {@code this}
+	 */
 	public RegexAutomaton trimRight() {
 		return this.toRegex().trimRight().simplify().toAutomaton(this);
 	}
 
+	/**
+	 * Yields a new automaton where trailing and leading whitespaces have been
+	 * removed from {@code this}.
+	 * 
+	 * @return a new automaton where trailing and leading whitespaces have been
+	 *             removed from {@code this}
+	 */
 	public RegexAutomaton trim() {
 		return this.toRegex().trimRight().simplify().trimLeft().simplify().toAutomaton(this);
 	}
diff --git a/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/Tarsis.java b/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/Tarsis.java
index ec17bf0b7..710edb96d 100644
--- a/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/Tarsis.java
+++ b/lisa/lisa-analyses/src/main/java/it/unive/lisa/analysis/string/tarsis/Tarsis.java
@@ -407,6 +407,18 @@ public Satisfiability containsChar(char c) throws SemanticException {
 				new Tarsis(RegexAutomaton.string(String.valueOf(c))), null);
 	}
 
+	/**
+	 * Yields a new Tarsis's instance recognizing each string of {@code this}
+	 * automaton repeated k-times, with k belonging to {@code intv}.
+	 * 
+	 * @param intv the interval
+	 * 
+	 * @return a new Tarsis's instance recognizing each string of {@code this}
+	 *             automaton repeated k-times, with k belonging to {@code intv}
+	 * 
+	 * @throws MathNumberConversionException if {@code intv} is iterated but is
+	 *                                           not finite
+	 */
 	public Tarsis repeat(Interval intv) throws MathNumberConversionException {
 		if (intv.isTop() || a.hasCycle())
 			return new Tarsis(a.star());
@@ -424,6 +436,13 @@ else if (intv.interval.isFinite()) {
 			return new Tarsis(a.repeat(intv.interval.getLow().toLong()).concat(a.star()));
 	}
 
+	/**
+	 * Yields a new Tarsis's instance where trailing and leading whitespaces
+	 * have been removed from {@code this}.
+	 * 
+	 * @return a new Tarsis's instance where trailing and leading whitespaces
+	 *             have been removed from {@code this}
+	 */
 	public Tarsis trim() {
 		return new Tarsis(this.a.trim());
 	}
diff --git a/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java b/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
index cd4344a9f..a876aef12 100644
--- a/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
+++ b/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
@@ -310,10 +310,33 @@ public String toString() {
 	 */
 	protected abstract Set<PartialSubstring> substringAux(int charsToSkip, int missingChars);
 
+	/**
+	 * Yields a new regular expression corresponding to the {@code n}-repetition
+	 * of {@code this}.
+	 * 
+	 * @param n number of repetitions
+	 * 
+	 * @return a new regular expression corresponding to the
+	 *             {@code n}-repetition of {@code this}
+	 */
 	public abstract RegularExpression repeat(long n);
 
+	/**
+	 * Yields a new regular expression where leading whitespaces have been
+	 * removed from {@code this}.
+	 * 
+	 * @return a new regular expression where leading whitespaces have been
+	 *             removed from {@code this}
+	 */
 	public abstract RegularExpression trimLeft();
 
+	/**
+	 * Yields a new regular expression where trailing whitespaces have been
+	 * removed from {@code this}.
+	 * 
+	 * @return a new regular expression where trailing whitespaces have been
+	 *             removed from {@code this}
+	 */
 	public abstract RegularExpression trimRight();
 
 	/**