JavaScript 正则表达式在字符串中重复元素匹配

Question

Yes I am a newbie, I have looked online and cannot seem to find the answer to the following, I know it must be simple.

I have a simple string and need to match spaced Capitals eg TG D......repeater, Secondly I need to match capitals with a dot between them and no space eg TGD.......repeater

I have the current string = str.match(/ [AZ] [AZ] | [AZ].[AZ]/g)

but this will only match the first two eg TG I Need it to match wherever it finds the following pattern eg TGDEF L...repeater as a one match

Likewise It will only match the TG but nothing after eg TG I Need to match T.GDLT repeater (may end with a dot and may not)

any help will be appreciated.

Answer 1

You might use a capturing group matching either a dot or a space in a character class ([. ])

Match the first 2 capitals and capture the space or dot in group 1. Then optionally repeat what is captured using a back reference followed by a captital AZ.

\b[A-Z]([. ])[A-Z](?:\1[A-Z])*\b

• \b Word boundary
• [AZ]([. ])[AZ] Match AZ, capture in group 1 matching either space or .
• (?:\1[AZ])* Repeat 0+ times matching what it captured in group 1 followed by AZ
• \b Word boundary

Regex demo