Regular Expressions 101

(?x)applies the following effective flags to the remainder of the pattern: gmx

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

^start of line

Comment: 这是注释

hello the literal text hello (case sensitive)

Comment: 这是注释

\ the literal (32₁₀ / 40₈ / 20₁₆)

word the literal text word (case sensitive)

Comment: 若其中某个空格需要匹配, 需使用\转义

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

hi the literal text hi (case sensitive)

Comment: 或者使用 [] 选中空格也可

$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

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Regular Expression

(?x)^ # 这是注释
hello  # 这是注释
\ word # 若其中某个空格需要匹配, 需使用\转义
[ ]hi  # 或者使用 [] 选中空格也可
$

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