StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<p>Try:</p> <pre><code>^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$ </code></pre> <p>Breaking it down:</p> <hr> <blockquote> <p><code>M{0,4}</code></p> </blockquote> <p>This specifies the thousands section and basically restrains it to between <code>0</code> and <code>4000</code>. It's a relatively simple:</p> <pre><code> 0: <empty> matched by M{0} 1000: M matched by M{1} 2000: MM matched by M{2} 3000: MMM matched by M{3} 4000: MMMM matched by M{4} </code></pre> <hr> <blockquote> <p><code>(CM|CD|D?C{0,3})</code></p> </blockquote> <p>Slightly more complex, this is for the hundreds section and covers all the possibilities:</p> <pre><code> 0: <empty> matched by D?C{0} (with D not there) 100: C matched by D?C{1} (with D not there) 200: CC matched by D?C{2} (with D not there) 300: CCC matched by D?C{3} (with D not there) 400: CD matched by CD 500: D matched by D?C{0} (with D there) 600: DC matched by D?C{1} (with D there) 700: DCC matched by D?C{2} (with D there) 800: DCCC matched by D?C{3} (with D there) 900: CM matched by CM </code></pre> <hr> <blockquote> <p><code>(XC|XL|L?X{0,3})</code></p> </blockquote> <p>Same rules as previous section but for the tens place:</p> <pre><code> 0: <empty> matched by L?X{0} (with L not there) 10: X matched by L?X{1} (with L not there) 20: XX matched by L?X{2} (with L not there) 30: XXX matched by L?X{3} (with L not there) 40: XL matched by XL 50: L matched by L?X{0} (with L there) 60: LX matched by L?X{1} (with L there) 70: LXX matched by L?X{2} (with L there) 80: LXXX matched by L?X{3} (with L there) 90: XC matched by XC </code></pre> <hr> <blockquote> <p><code>(IX|IV|V?I{0,3})</code></p> </blockquote> <p>This is the units section, handling <code>0</code> through <code>9</code> and also similar to the previous two sections (Roman numerals, despite their seeming weirdness, follow some logical rules once you figure out what they are):</p> <pre><code>0: <empty> matched by V?I{0} (with V not there) 1: I matched by V?I{1} (with V not there) 2: II matched by V?I{2} (with V not there) 3: III matched by V?I{3} (with V not there) 4: IV matched by IV 5: V matched by V?I{0} (with V there) 6: VI matched by V?I{1} (with V there) 7: VII matched by V?I{2} (with V there) 8: VIII matched by V?I{3} (with V there) 9: IX matched by IX </code></pre>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload