natural works

src/find-natural.py

@@ -0,0 +1,43 @@
+#!/usr/bin/python3
+import ply.lex
+tokens = [
+    'NUMBER',
+    'ANY'
+]
+
+def t_NUMBER(t):
+    r'[^-\.,(0\d*)]([1-9][0-9]*)'
+    t.value = int(t.value)
+    print(t.value)
+    return t
+
+def t_error(t):
+    pass
+
+def t_ANY(t):
+    r'.'
+    pass
+
+def t_newline(t):
+    r'\n'
+    pass
+
+lexer = ply.lex.lex()
+
+data = """
+This is a text containing five 55 lines, two 2 of which are empty.
+This is the second 2 non-empty line,
+and this is the third 3 non-empty line 5758.
+you are 0
+
+bad stuff
+0111001
+vsadads -500
+.5
+0.2324
+0,2324
+"""
+
+lexer.input(data)
+for t in lexer:
+    pass