Regular Expressions 101

Explanation

Pro

Group 1(\d+\.?(?:\d{1,2})?)

\d+a digit, repeated at least once

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:\d{1,2})?

?repeats the group contents below at most once:

\d{1,2}a digit, repeated between 1 and 2 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 2(\bmillions?\b|\bbillions?\b|\btrillions?\b|\bmeters?\b|\bmiles?\b|\%)

1st Alternative\bmillions?\b

\ban ASCII word boundary

millionthe literal text million (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\ban ASCII word boundary

2nd Alternative\bbillions?\b

\ban ASCII word boundary

billionthe literal text billion (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\ban ASCII word boundary

3rd Alternative\btrillions?\b

\ban ASCII word boundary

trillionthe literal text trillion (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\ban ASCII word boundary

4th Alternative\bmeters?\b

\ban ASCII word boundary

meterthe literal text meter (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\ban ASCII word boundary

5th Alternative\bmiles?\b

\ban ASCII word boundary

milethe literal text mile (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\ban ASCII word boundary

6th Alternative\%

\%the literal % (37₁₀ / 45₈ / 25₁₆)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

26 tokens

Regular Expression

(\d+\.?(?:\d{1,2})?) (\bmillions?\b|\bbillions?\b|\btrillions?\b|\bmeters?\b|\bmiles?\b|\%)

3 billion
3 million
3 %
2 meters

Substitution

<span class='highlighted'>" $1_$2 "</span>

3 billion
3 million
3 %
2 meters