Regular Expressions 101

Pro

^start of line

Group 1([ \t]*)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group 2(.*?(?:[\u3000-\u303F]|[\u3040-\u309F]|[\u30A0-\u30FF]|[\uFF00-\uFFEF]|[\u4E00-\u9FAF]|[\u2605-\u2606]|[\u2190-\u2195]|\u203B).*?)

.*?any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:[\u3000-\u303F]|[\u3040-\u309F]|[\u30A0-\u30FF]|[\uFF00-\uFFEF]|[\u4E00-\u9FAF]|[\u2605-\u2606]|[\u2190-\u2195]|\u203B)

1st Alternative[\u3000-\u303F]

Character Class[\u3000-\u303F]

\u3000-\u303Fone character from 　 (12288₁₀) to 〿 (12351₁₀)

2nd Alternative[\u3040-\u309F]

Character Class[\u3040-\u309F]

\u3040-\u309Fone character from ぀ (12352₁₀) to ゟ (12447₁₀)

3rd Alternative[\u30A0-\u30FF]

Character Class[\u30A0-\u30FF]

\u30A0-\u30FFone character from ゠ (12448₁₀) to ヿ (12543₁₀)

4th Alternative[\uFF00-\uFFEF]

Character Class[\uFF00-\uFFEF]

\uFF00-\uFFEFone character from ＀ (65280₁₀) to ￯ (65519₁₀)

5th Alternative[\u4E00-\u9FAF]

Character Class[\u4E00-\u9FAF]

\u4E00-\u9FAFone character from 一 (19968₁₀) to 龯 (40879₁₀)

6th Alternative[\u2605-\u2606]

Character Class[\u2605-\u2606]

\u2605-\u2606one character from ★ (9733₁₀) to ☆ (9734₁₀)

7th Alternative[\u2190-\u2195]

Character Class[\u2190-\u2195]

\u2190-\u2195one character from ← (8592₁₀) to ↕ (8597₁₀)

8th Alternative\u203B

\u203Bthe literal ※ (203B₁₆ / 20073₈ / 8251₁₀)

.*?any character (except for line terminators), repeated any number of times

Group 3([ \t]*)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

$end of line

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

No unit tests · Add a test to get started

26 tokens

^([ \t]*)(.*?(?:[\u3000-\u303F]|[\u3040-\u309F]|[\u30A0-\u30FF]|[\uFF00-\uFFEF]|[\u4E00-\u9FAF]|[\u2605-\u2606]|[\u2190-\u2195]|\u203B).*?)([ \t]*)$

There are no unit tests, click to add some.