Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\d+(?:st|nd|rd|th)$)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:st|nd|rd|th)

1st Alternativest

stthe literal text st (case sensitive)

2nd Alternativend

ndthe literal text nd (case sensitive)

3rd Alternativerd

rdthe literal text rd (case sensitive)

4th Alternativeth

ththe literal text th (case sensitive)

$end of line

.*any Unicode character (except for line terminators), repeated any number of times

$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

^(?!\d+(?:st|nd|rd|th)$).*$

New

1Z83E0590391137855
55t5555t5t5tttt5t5555tttttttgggggggggggggggsss
1st
2nd
3rd
4th
5th