T5058: Add template filter range_to_regex

Add template filter 'range_to_regex'
Convert range of numbers or list of ranges to regex

   % range_to_regex('11-12')
   '(1[1-2])'
   % range_to_regex(['11-12', '14-15'])
   '(1[1-2]|1[4-5])'

1 files changed, 25 insertions, 0 deletions

diff --git a/python/vyos/template.py b/python/vyos/template.py
index 4778bf1c8..c98d6874e 100644
--- a/python/vyos/template.py
+++ b/python/vyos/template.py
@@ -362,3 +362,28 @@ def get_ipv4(interface):
     """ Get interface IPv4 addresses"""
     from vyos.ifconfig import Interface
     return Interface(interface).get_addr_v4()
+
+@register_filter('range_to_regex')
+def range_to_regex(num_range):
+    """Convert range of numbers or list of ranges
+       to regex
+       % range_to_regex('11-12')
+       '(1[1-2])'
+       % range_to_regex(['11-12', '14-15'])
+       '(1[1-2]|1[4-5])'
+    """
+    from vyos.range_regex import range_to_regex
+    if isinstance(num_range, list):
+        data = []
+        for entry in num_range:
+            if '-' not in entry:
+                data.append(entry)
+            else:
+                data.append(range_to_regex(entry))
+        return f'({"|".join(data)})'
+
+    if '-' not in num_range:
+        return num_range
+
+    regex = range_to_regex(num_range)
+    return f'({regex})'