Regular Expressions 101

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group 1(\s*[+-]?[0-9])

\s*any whitespace character, repeated any number of times

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9]

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

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.

Search reference

Regular Expression

<(\s*[+-]?[0-9])

New

<p>I am <30 years old and weight <12st I am <  30 years old and weight <  12st I am <30 years old and weight <  -12st I am <  +30 years old and weight <  12st</p>

Substitution

&lt;$1