Regular Expressions 101

Explanation
Pro

Non-Capturing Group(?:height=12>\s<b>(?:\d+\s)?[a-zA-Z]+)

height=12>the literal text height=12> (case sensitive)

\sa Unicode whitespace character

<b>the literal text <b> (case sensitive)

Non-Capturing Group(?:\d+\s)?

?repeats the group contents below at most once:

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

\sa Unicode whitespace character

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

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

\sa Unicode whitespace character

Character Class[0-9]+

+matches at least one character from the set below:

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

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

(?:height=12>\s<b>(?:\d+\s)?[a-zA-Z]+)(\s[0-9]+)

New

height=12> <b>adfdf 1 height=12> <b>adfdf 34

height=12> <b>adfdf 1 height=12> <b>adfdf 34