Update README.md

mapbox · May 8, 2012 · 9d2863b · 9d2863b
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+## Filters
+
+Carto supports a variety of filter styles:
+
+Numeric comparisons:
+
+```
+#world[population > 100]
+#world[population < 100]
+#world[population >= 100]
+#world[population <= 100]
+```
+
+General comparisons:
+
+```
+#world[population = 100]
+#world[population != 100]
+```
+
+
+String comparisons:
+
+```
+/* a regular expression over name */
+#world[name =~ "A.*"]
+```
 
 ## Usage