Let's sort out this regex issue so you only strip hashtags from the start of your paragraph, keeping the ones in the middle intact.

The Problem with Your Current Regex #

Your existing regex /(?<! \w\s+)(#[a-zA-Z]+ *)/g is too broad—it's matching hashtags anywhere that don't have a "space + word + spaces" before them. That's why your middle #ads is getting removed (since it comes after a period and space, which doesn't meet the negative lookbehind condition).

The Corrected Regex #

You need to specifically target only hashtags at the very start of the string, in a continuous block. Use this regex instead:

{{replaceRegex var.a '/^(\#[a-zA-Z]+\s*)+/g' ""}}

How This Works #

Let's break down the regex:

• ^: Anchors the match to the start of the string—so we only look for hashtags right at the beginning.
• (\#[a-zA-Z]+\s*)+: Matches one or more consecutive leading hashtags:
  • \#[a-zA-Z]+: Matches a single hashtag (starting with #, followed by one or more letters)
  • \s*: Matches zero or more spaces after the hashtag (handles cases where there's a space between leading hashtags, or a trailing space before the main text)
  • The outer + ensures we catch all consecutive leading hashtags (like #abc #def in your example)

Result #

Applying this to your sample text:

Original: #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.
After replacement: This is a test paragraph. #ads I only want to remove the hashtags at the beginning and keep the hashtag at the center.

Perfect—this keeps your middle #ads exactly as you wanted!

内容的提问来源于stack exchange，提问作者Shibin