Regular Expressions 101

1st Alternative[a-z_A-Z]+(?=\=)

Character Class[a-z_A-Z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Positive Lookahead(?=\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

2nd Alternative(?<=\=)\w+(?# =后面的变量或者数字)

Positive Lookbehind(?<=\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

\w+a Unicode word character, repeated at least once

Comment: =后面的变量或者数字

3rd Alternative(?<=\=)\'.+\'

Positive Lookbehind(?<=\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

.+any Unicode character (except for line terminators), repeated at least once

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

4th Alternative(?<=\=)\".+\"(?# =后面的字符串)

Positive Lookbehind(?<=\=)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

.+any Unicode character (except for line terminators), repeated at least once

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Comment: =后面的字符串

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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25 tokens

Regular Expression

[a-z_A-Z]+(?=\=)|(?<=\=)\w+(?# =后面的变量或者数字)|(?<=\=)\'.+\'|(?<=\=)\".+\"(?# =后面的字符串)

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