diff --git a/tools/toolchains/arm.py b/tools/toolchains/arm.py
index 9949605f65..7d745b438d 100644
--- a/tools/toolchains/arm.py
+++ b/tools/toolchains/arm.py
@@ -41,7 +41,7 @@ class ARM(mbedToolchain):
     SUPPORTED_CORES = ["Cortex-M0", "Cortex-M0+", "Cortex-M3", "Cortex-M4",
                        "Cortex-M4F", "Cortex-M7", "Cortex-M7F", "Cortex-M7FD", "Cortex-A9"]
     ARMCC_RANGE = (LooseVersion("5.06"), LooseVersion("5.07"))
-    ARMCC_VERSION_RE = re.compile("^Product: ARM Compiler (\d+.\d+)")
+    ARMCC_VERSION_RE = re.compile("Product: ARM Compiler (\d+.\d+)")
 
     @staticmethod
     def check_executable():
@@ -98,17 +98,16 @@ class ARM(mbedToolchain):
         stdout, _, retcode = run_cmd([self.cc[0], "--vsn"], redirect=True)
         msg = None
         min_ver, max_ver = self.ARMCC_RANGE
-        first_line = stdout.splitlines()[0]
-        match = self.ARMCC_VERSION_RE.match(first_line)
-        if match:
-            found_version = LooseVersion(match.group(1))
-            if found_version < min_ver or found_version > max_ver:
-                msg = ("Compiler version mismatch: Have {}; "
-                       "expected >= {} < {}"
-                       .format(found_version, min_ver, max_ver))
-        else:
+        match = self.ARMCC_VERSION_RE.search(stdout)
+        found_version = LooseVersion(match.group(0)) if match else None
+        min_ver, max_ver = self.ARM_RANGE
+        if found_version and (found_version < min_ver or found_version >= max_ver):
+            msg = ("Compiler version mismatch: Have {}; "
+                   "expected version >= {} and < {}"
+                   .format(found_version, min_ver, max_ver))
+        elif len(match.groups()) != 1:
             msg = ("Compiler version mismatch: Could not detect version; "
-                   "expected >= {} < {}"
+                   "expected version >= {} and < {}"
                    .format(min_ver, max_ver))
 
         if msg:
diff --git a/tools/toolchains/gcc.py b/tools/toolchains/gcc.py
index 6629f6e41a..d61fa57bc5 100644
--- a/tools/toolchains/gcc.py
+++ b/tools/toolchains/gcc.py
@@ -114,18 +114,15 @@ class GCC(mbedToolchain):
 
     def version_check(self):
         stdout, _, retcode = run_cmd([self.cc[0], "--version"], redirect=True)
-        found_version = None
-        for line in stdout.splitlines():
-            for word in line.split():
-                match = self.GCC_VERSION_RE.match(word)
-                if match:
-                    found_version = LooseVersion(match.group(0))
+        msg = None
+        match = self.GCC_VERSION_RE.search(stdout)
+        found_version = LooseVersion(match.group(0)) if match else None
         min_ver, max_ver = self.GCC_RANGE
         if found_version and (found_version < min_ver or found_version >= max_ver):
             msg = ("Compiler version mismatch: Have {}; "
                    "expected version >= {} and < {}"
                    .format(found_version, min_ver, max_ver))
-        elif not found_version:
+        elif len(match.groups()) != 1:
             msg = ("Compiler version mismatch: Could not detect version; "
                    "expected version >= {} and < {}"
                    .format(min_ver, max_ver))
diff --git a/tools/toolchains/iar.py b/tools/toolchains/iar.py
index b725a1111e..4f066cd0f7 100644
--- a/tools/toolchains/iar.py
+++ b/tools/toolchains/iar.py
@@ -97,16 +97,13 @@ class IAR(mbedToolchain):
 
     def version_check(self):
         stdout, _, retcode = run_cmd([self.cc[0], "--version"], redirect=True)
-        found_version = None
-        for line in stdout.splitlines():
-            match = self.IAR_VERSION_RE.match(line)
-            if match:
-                found_version = match.group(1)
         msg = None
+        match = self.IAR_VERSION_RE.search(stdout)
+        found_version = match.group(1) if match else None
         if found_version and LooseVersion(found_version) != self.IAR_VERSION:
             msg = "Compiler version mismatch: Have {}; expected {}".format(
                 found_version, self.IAR_VERSION)
-        elif not found_version:
+        elif len(match.groups()) != 1:
             msg = ("Compiler version mismatch: Could Not detect compiler "
                    "version; expected {}".format(self.IAR_VERSION))
         if msg: