Regular Expressions 101

Pro

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

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)

Non-Capturing Group(?: +#[a-zA-Z]+)*

*repeats the group contents below any number of times:

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

#the literal # (35₁₀ / 43₈ / 23₁₆)

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)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

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-Z]+(?: +#[a-zA-Z]+)* *

New

#abc #def This is a test paragraph. #ads I only want to remove the hashtags at the beginning and keep the hashtag at the center.

#abc #def This is a test paragraph. #ads I only want to remove the hashtags at the beginning and keep the hashtag at the center.