3 files changed, 29 insertions, 0 deletions
diff --git a/src/utils/stringutils.cpp b/src/utils/stringutils.cpp
index da3f8dd06..a54d9d5ab 100644
--- a/src/utils/stringutils.cpp
+++ b/src/utils/stringutils.cpp
@@ -697,3 +697,17 @@ std::string toStringPrint(const unsigned int val)
     str[99] = 0;
     return str;
 }
+
+bool isDigit(const std::string &str)
+{
+    if (str.empty())
+        return false;
+    const size_t sz = str.size();
+    for (size_t f = 0; f < sz; f ++)
+    {
+        const char &chr = str[f];
+        if (chr < '0' || chr > '9')
+            return false;
+    }
+    return true;
+}
diff --git a/src/utils/stringutils.h b/src/utils/stringutils.h
index 737b5c8f3..7f40b3673 100644
--- a/src/utils/stringutils.h
+++ b/src/utils/stringutils.h
@@ -230,4 +230,6 @@ std::string encodeLinkText(std::string data);
 
 std::string decodeLinkText(std::string data);
 
+bool isDigit(const std::string &str);
+
 #endif  // UTILS_STRINGUTILS_H
diff --git a/src/utils/stringutils_unittest.cc b/src/utils/stringutils_unittest.cc
index 75f4f2f35..8f28f5c10 100644
--- a/src/utils/stringutils_unittest.cc
+++ b/src/utils/stringutils_unittest.cc
@@ -551,3 +551,16 @@ TEST(stringuntils, decodeLinkText)
     str = decodeLinkText(str);
     EXPECT_EQ(str, "test|line");
 }
+
+TEST(stringuntils, isDigit)
+{
+    std::string str;
+
+    EXPECT_FALSE(isDigit(""));
+    EXPECT_TRUE(isDigit("1"));
+    EXPECT_TRUE(isDigit("123"));
+    EXPECT_FALSE(isDigit("+123"));
+    EXPECT_FALSE(isDigit("-123"));
+    EXPECT_FALSE(isDigit("1.23"));
+    EXPECT_FALSE(isDigit("12-34"));
+}