Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:[a-zA-Z0-9 ]|<(?= ))+

+repeats the group contents below at least once:

1st Alternative[a-zA-Z0-9 ]

Character Class[a-zA-Z0-9 ]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

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

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative<(?= )

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Positive Lookahead(?= )

the literal (32₁₀ / 40₈ / 20₁₆)

$end of line

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

Detailed match information will be displayed here automatically.

25 tokens

^(?:[a-zA-Z0-9 ]|<(?= ))+$

New

abAD 45
abAD< 45
abAD 45<
abAD 45<

abAD 45
abAD< 45
abAD 45<
abAD 45<