[gen] Added a validator for String fields, for validating Belgian NISS numbers.

shared/utils.py

@@ -227,12 +227,19 @@ def normalizeString(s, usage='fileName'):
         res = s
     return res
 
-# ------------------------------------------------------------------------------
 def normalizeText(s):
     '''Normalizes p_s: remove special chars, lowerizes it, etc, for indexing
        purposes.'''
     return normalizeString(s, usage='extractedText').strip().lower()
 
+def keepDigits(s):
+    '''Returns string p_s whose non-number chars have been removed.'''
+    if s is None: return s
+    res = ''
+    for c in s:
+        if c.isdigit(): res += c
+    return res
+
 # ------------------------------------------------------------------------------
 def formatNumber(n, sep=',', precision=2, tsep=' '):
     '''Returns a string representation of number p_n, which can be a float