regex101: PCRE (Legacy) Match Workspace

^start of line

Negative Lookahead(?!.*\/s\/123)

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

123the literal text 123

Negative Lookahead(?!.*\/s\/32A )

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

32A the literal text 32A (case sensitive)

Negative Lookahead(?!.*atr\/will)

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

atrthe literal text atr (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

willthe literal text will (case sensitive)

Group 1([\/a-zA-Z]*)

Character Class[\/a-zA-Z]*

*matches any number of characters from the set below:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

_MyWordthe literal text _MyWord (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(.*)

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

$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

Search reference

Regular Expression

^(?!.*\/s\/123)(?!.*\/s\/32A )(?!.*atr\/will)([\/a-zA-Z]*)\/_MyWord\/(.*)$

New

/s/123/QWERERTYU/_MyWord/45454545
atr/will/DFGH/FGHJK/GHJK/_MyWord/DFGHJ452
/DFGH/FGHJK/GHJK/_MyWord/DFGHJ452
HiCanYouHelpMe/_MyWord/fgh
/_MyWord/HiCanYouHelpMefgh

I am handling user input in my program by using regular exp.

the string contains /_MyWord/ and only a-z is accepted before /_MyWord/.
the string not contain /s/123, /s/32A and atr/will in the beginning.
My try:

^(?!.*/s/123)(?!.*/s/32A )(?!.*atr/will)([/a-z]+)/_MyWord/(.*)$
Example:

/s/123/QWERERTYU/_MyWord/45454545 -> fail
/DFGH/FGHJK/GHJK/_MyWord/DFGHJ452 -> OK
HiCanYouHelpMe/_MyWord/fgh        -> OK
/_MyWord/HiCanYouHelpMefgh        -> OK