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Comment: Markup corrected

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For example, suppose you want to find the value from the following snippet:

No Format

input type="hidden" name="secret" value="CAFEBABE.12345(3)"

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If not, examine the expression for any meta-characters (characters that have a special meaning in regexes).In this case, the only special characters are the "." and the parentheses "(" and ")".These need to be escaped, by being prefixed with "\". We now have:

No Format

input type="hidden" name="secret" value="CAFEBABE\.12345\(3\)"

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So assume you want to match just

No Format

CAFEBABE.12345

Your regular expression then becomes:

No Format

input type="hidden" name="secret" value="(CAFEBABE\.12345)\(3\)"

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A digit is easy, that's "\d", so a number is "\d+", where the "+" means one or more of the previous item.

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A

...

hex

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character

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can

...

be

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represented

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by

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"

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[0-9A-Za-z

...

]".

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The

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enclosing

...

"

...

[

...

]"

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create

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a

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character

...

class

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which

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matches

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one

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of

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the

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specified

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characters.

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The

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"-"

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here

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means

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a

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range

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So putting that together, we get:

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No Format
input type="hidden" name="secret" value="([^"]+)"
Wiki Markup

The

...

character

...

class

...

in

...

this

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case

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is

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[^"

...

]

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which

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means

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any

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character

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except

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double-quote.

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The

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"+"

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suffix

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means

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we

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want

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as

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many

...

as

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there

...

are

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in

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succession.

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This

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will

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take

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us

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up

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to

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the

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end

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of

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the

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value.

Hints and tips

If the expression matches more than once in the source, you have a choice:

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