Regular Expressions 101

;center=the literal text ;center= (case sensitive)

Group 1([.\d]+)

Character Class[.\d]+

+matches at least one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

%?optionally matches the literal % (37₁₀ / 45₈ / 25₁₆)

Character Class[0-9A-Z]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Group 2([-.\d+]+)

Character Class[-.\d+]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

;center=([.\d]+)%?[0-9A-Z]+([-.\d+]+)

Test String
New

<img alt="Map" height="135" src="http://maps.google.com/maps/api/staticmap?scale=2&amp;center=45.504358%2C-73.553712&amp;language=en&amp;zoom=15&amp;markers=scale%3A2%7Cshadow%3Afalse%7Cicon%3Ahttp%3A%2F%2Fyelp-images.s3.amazonaws.com%2Fassets%2Fmap-markers%2Fannotation_64x86.png%7C45.504358%2C-73.553712&amp;client=gme-yelp&amp;sensor=false&amp;size=286x135&amp;signature=nM1FwS0L3z_VgK2ljaRcJf11HxA=" width="286">

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...