Regular Expressions 101

Pro

\ban ASCII word boundary

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 1(px|r?em)

1st Alternativepx

pxthe literal text px (case sensitive)

2nd Alternativer?em

r?optionally matches the literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

emthe literal text em (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

\b0(px|r?em)

New

.foo {
  padding: 0px;
}

.bar {
  padding: 10px;
}

.baz {
  margin-bottom: 0rem;
  padding-left: 123px;
}